dr. arvind`s biology classes
... 113. The embryo at 16-celled stage is known as: a) morula b) gastrula c) blastula d) blastomere Ans. (a) 114. Zone pellucida disintegrates a) just after fertilization b) before fertilization c) before cleavage d) after completion of cleavage Ans. (d) 115. Which germ layer develops first during embry ...
... 113. The embryo at 16-celled stage is known as: a) morula b) gastrula c) blastula d) blastomere Ans. (a) 114. Zone pellucida disintegrates a) just after fertilization b) before fertilization c) before cleavage d) after completion of cleavage Ans. (d) 115. Which germ layer develops first during embry ...
Embryonic Folding and Coelom Development
... tucked in under the back end of the ballooned-out roof of the yolk sac. And that little region of the extraembryonic coelom we had marked with an asterisk is getting tucked in as well, but it still has the same relationship to the allantois and connecting stalk as it always had. And finally, I note ...
... tucked in under the back end of the ballooned-out roof of the yolk sac. And that little region of the extraembryonic coelom we had marked with an asterisk is getting tucked in as well, but it still has the same relationship to the allantois and connecting stalk as it always had. And finally, I note ...
Gametogenesis: Conversion of Germ Cells Into Male and Female
... significantly increased our knowledge of embryology and its relevance. Because birth defects are the leading cause of infant mortality and a major contributor to disabilities, and because new prevention strategies have been developed, understanding the principles of embryology is important for health ...
... significantly increased our knowledge of embryology and its relevance. Because birth defects are the leading cause of infant mortality and a major contributor to disabilities, and because new prevention strategies have been developed, understanding the principles of embryology is important for health ...
LIEDER Prepared Microscope Slides Multimedia
... LIEDER prepared microscope slides are made in our laboratories under scientific control. They are the product of long experience in all spheres of preparation techniques. Microtome sections are cut by highly skilled staff, cutting technique and thickness of the sections are adjusted to the objects. ...
... LIEDER prepared microscope slides are made in our laboratories under scientific control. They are the product of long experience in all spheres of preparation techniques. Microtome sections are cut by highly skilled staff, cutting technique and thickness of the sections are adjusted to the objects. ...
Development of the Ethmoid Sinus and Extramural Migration: The
... Cave (1967). In this view a ‘‘true’’ paranasal sinus must have its respiratory diverticulum originate from, and remain in communication with, the nasal cavity. Its growth must be from a given meatus of the nasal cavity, and it must retain a patent communication via an ostium that remains permanently ...
... Cave (1967). In this view a ‘‘true’’ paranasal sinus must have its respiratory diverticulum originate from, and remain in communication with, the nasal cavity. Its growth must be from a given meatus of the nasal cavity, and it must retain a patent communication via an ostium that remains permanently ...
science - Christian Schools International
... • Reinforce/Assess enables you to test students’ learning and strengthen their understanding of lesson concepts. A simple reinforcement activity may also be included in this section. • Many Extend activities are provided at the end of each lesson. These activities include additional science experi ...
... • Reinforce/Assess enables you to test students’ learning and strengthen their understanding of lesson concepts. A simple reinforcement activity may also be included in this section. • Many Extend activities are provided at the end of each lesson. These activities include additional science experi ...
Zimmer Humeral Stem Four-Part Fracture Surgical Technique
... (usually the lesser tuberosity) are together, and both are separated from the shaft and the other tuberosity. Most three-part fractures are best treated by internal fixation. However, in some elderly patients with very osteoporotic bone, it may be difficult to achieve adequate fixation to allow earl ...
... (usually the lesser tuberosity) are together, and both are separated from the shaft and the other tuberosity. Most three-part fractures are best treated by internal fixation. However, in some elderly patients with very osteoporotic bone, it may be difficult to achieve adequate fixation to allow earl ...
Animal Evolution - Amazon Web Services
... similarity between organisms. The term ‘homology’ had already been in use for some time, and Owen (1848) had used it in a practical attempt to create a common anatomical nomenclature for the vertebrates, but it was Darwin’s ideas about evolution that gave the word its present meaning and importance: ...
... similarity between organisms. The term ‘homology’ had already been in use for some time, and Owen (1848) had used it in a practical attempt to create a common anatomical nomenclature for the vertebrates, but it was Darwin’s ideas about evolution that gave the word its present meaning and importance: ...
Brachial muscles in the chick embryo: the fate of
... Like Sullivan (1962), I have treated these two muscles together because at their insertion end they merge into one muscle. The subscapularis originates from the ventral region of the scapula; the subcoracoideus originates from the dorsal region of the coracoid. The two muscles merge distally and att ...
... Like Sullivan (1962), I have treated these two muscles together because at their insertion end they merge into one muscle. The subscapularis originates from the ventral region of the scapula; the subcoracoideus originates from the dorsal region of the coracoid. The two muscles merge distally and att ...
The pharyngeal pouches and clefts
... entering the body through the oral cavity [43]. Nonetheless, at odds with their role in activating immune responses, the tonsils are frequently colonised by potentially invasive micro-organisms, the accidental spread of which may cause recurrent throat infections ...
... entering the body through the oral cavity [43]. Nonetheless, at odds with their role in activating immune responses, the tonsils are frequently colonised by potentially invasive micro-organisms, the accidental spread of which may cause recurrent throat infections ...
The pharyngeal pouches and clefts: Development, evolution
... entering the body through the oral cavity [43]. Nonetheless, at odds with their role in activating immune responses, the tonsils are frequently colonised by potentially invasive micro-organisms, the accidental spread of which may cause recurrent throat infections ...
... entering the body through the oral cavity [43]. Nonetheless, at odds with their role in activating immune responses, the tonsils are frequently colonised by potentially invasive micro-organisms, the accidental spread of which may cause recurrent throat infections ...
1 2. Endoscopic Anatomy of the Paranasal Sinuses Anatomical
... the septum without the danger of a CSF fistula. The superior nasal meatus is difficult to inspect, particularly if the septum is widened or deviated. In front, it contains the olfactory cleft, a narrow slit extending superiorly between the middle turbinate and the nasal septum to the roof of the nos ...
... the septum without the danger of a CSF fistula. The superior nasal meatus is difficult to inspect, particularly if the septum is widened or deviated. In front, it contains the olfactory cleft, a narrow slit extending superiorly between the middle turbinate and the nasal septum to the roof of the nos ...
Folio Bound VIEWS - Gray`s Anatomy
... cleavage patterns after fertilization, they achieve through gastrulation a remarkably similar result (see p. 100 ). It is in this context that gastrulation, as the essential prerequisite for the determination of triploblastic structure, may indeed be regarded as the single most important event in, a ...
... cleavage patterns after fertilization, they achieve through gastrulation a remarkably similar result (see p. 100 ). It is in this context that gastrulation, as the essential prerequisite for the determination of triploblastic structure, may indeed be regarded as the single most important event in, a ...
On the Growth in Length of the Prog Embryo.
... blastopore, the embryo grows in length by the proliferation of cells at the spot which formerly formed part of the lips of the blastopore. There is very little doubt that rapid growth at this spot takes place before the final closure of the blastopore ; the question is, when does this growth begin ? ...
... blastopore, the embryo grows in length by the proliferation of cells at the spot which formerly formed part of the lips of the blastopore. There is very little doubt that rapid growth at this spot takes place before the final closure of the blastopore ; the question is, when does this growth begin ? ...
The Swimming Setae of Daphnia carinata By W. E. AGAR
... These hairs are absent from the dorsal ramus. In addition, the whole surface of the antenna is closely set with fine pointed spines. Immediately after ecdysis, the centre of the seta is occupied by a protoplasmic axial fibre, which can be traced almost to the tip of the seta. Later in the instar, th ...
... These hairs are absent from the dorsal ramus. In addition, the whole surface of the antenna is closely set with fine pointed spines. Immediately after ecdysis, the centre of the seta is occupied by a protoplasmic axial fibre, which can be traced almost to the tip of the seta. Later in the instar, th ...
Ch 4
... nodes – supporting network around fat cells, nerve fibers, and skeletal and smooth muscle fibers. ...
... nodes – supporting network around fat cells, nerve fibers, and skeletal and smooth muscle fibers. ...
Morphological Characteristics of the Developing Cranial Nerves and
... the segmentation of somites in the trunk, and these epithelial mesodermal regions maintain a close relationship with peripheral nerve distribution in the shark embryo (Kuratani and Horigome, 2000). The head cavities become less distinct in amniotes, although epithelial mesodermal cysts do develop in ...
... the segmentation of somites in the trunk, and these epithelial mesodermal regions maintain a close relationship with peripheral nerve distribution in the shark embryo (Kuratani and Horigome, 2000). The head cavities become less distinct in amniotes, although epithelial mesodermal cysts do develop in ...
Lesson Overview
... About six or seven days after fertilization, the blastocyst attaches to the wall of the uterus and begins to grow into the tissues of the mother (number 8 in figure.) This process is known as implantation. ...
... About six or seven days after fertilization, the blastocyst attaches to the wall of the uterus and begins to grow into the tissues of the mother (number 8 in figure.) This process is known as implantation. ...
Introduction
... 4. Wherever “observe” comes, carry out the observation and fill up the observations in the space provided for observations and documentation or in your notebook. The sequence of different observations is indicated by numbers 1,2,3 etc. Record observations in the correct sequence. Try noting down the ...
... 4. Wherever “observe” comes, carry out the observation and fill up the observations in the space provided for observations and documentation or in your notebook. The sequence of different observations is indicated by numbers 1,2,3 etc. Record observations in the correct sequence. Try noting down the ...
4. Tissue Level of Organization
... traveling between neighboring cells. Ions, glucose, amino acids, and other small solutes can pass directly from the cytoplasm of one cell into the neighboring cell through these channels. The flow of ions between cells coordinates such cellular activities as the beating of cilia. Gap junctions are a ...
... traveling between neighboring cells. Ions, glucose, amino acids, and other small solutes can pass directly from the cytoplasm of one cell into the neighboring cell through these channels. The flow of ions between cells coordinates such cellular activities as the beating of cilia. Gap junctions are a ...
Radiological anatomy of frontal sinus (PDF Available)
... Introduction: Frontal sinus is a complex and highly variable structure. These anatomic variations have a tremendous impact on the direction of drainage, efficiency of mucociliary clearance mechanism and frontal recess morphology. CT scans of frontal sinus have conventionally being performed with con ...
... Introduction: Frontal sinus is a complex and highly variable structure. These anatomic variations have a tremendous impact on the direction of drainage, efficiency of mucociliary clearance mechanism and frontal recess morphology. CT scans of frontal sinus have conventionally being performed with con ...
Get cached PDF
... absence or reduction of posterior mesoderm and notochord, the same tissues that express the Brachyury message and protein (Wilkinson et al., 1990; Schulte-Merker et al., 1992; Kispert and Herrmann, 1994). Correspondingly, the phenotype of Brachyury mutations in mouse can be rescued by a transgene of ...
... absence or reduction of posterior mesoderm and notochord, the same tissues that express the Brachyury message and protein (Wilkinson et al., 1990; Schulte-Merker et al., 1992; Kispert and Herrmann, 1994). Correspondingly, the phenotype of Brachyury mutations in mouse can be rescued by a transgene of ...
Tissues
... An Introduction to Tissues • Learning Outcomes • 4-4 Compare the structures and functions of the various types of connective tissues. • 4-5 Describe how cartilage and bone function as a supporting connective tissue. • 4-6 Explain how epithelial and connective tissues combine to form four types of t ...
... An Introduction to Tissues • Learning Outcomes • 4-4 Compare the structures and functions of the various types of connective tissues. • 4-5 Describe how cartilage and bone function as a supporting connective tissue. • 4-6 Explain how epithelial and connective tissues combine to form four types of t ...
4-4 Connective Tissue
... An Introduction to Tissues • Learning Outcomes • 4-4 Compare the structures and functions of the various types of connective tissues. • 4-5 Describe how cartilage and bone function as a supporting connective tissue. • 4-6 Explain how epithelial and connective tissues combine to form four types of t ...
... An Introduction to Tissues • Learning Outcomes • 4-4 Compare the structures and functions of the various types of connective tissues. • 4-5 Describe how cartilage and bone function as a supporting connective tissue. • 4-6 Explain how epithelial and connective tissues combine to form four types of t ...
Embryonic stem cell
Embryonic stem cells (ES cells) are pluripotent stem cells derived from the inner cell mass of a blastocyst, an early-stage preimplantation embryo. Human embryos reach the blastocyst stage 4–5 days post fertilization, at which time they consist of 50–150 cells. Isolating the embryoblast or inner cell mass (ICM) results in destruction of the blastocyst, which raises ethical issues, including whether or not embryos at the pre-implantation stage should be considered to have the same moral or legal status as more developed human beings.Human ES cells measure approximately 14 μm while mouse ES cells are closer to 8 μm.