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The Human Body: Anatomical Regions, Directions, Body Cavities, and Homeostasis Credit: Carlos J Bidot Author 2006 Revised 2010 Overview of Anatomy and Physiology • Anatomy – the study of the structure of body parts and their relationships to one another – Gross or macroscopic – Microscopic – Developmental • Physiology – the study of the function of the body’s structural machinery Gross Anatomy • Regional – all structures in one part of the body (such as the abdomen or leg) • Systemic – gross anatomy of the body studied by system • Surface – study of internal structures as they relate to the overlying skin Microscopic Anatomy • Cytology – study of the cell • Histology – study of tissues Developmental Anatomy • Traces structural changes throughout life • Embryology – study of developmental changes of the body before birth Specialized Branches of Anatomy • Pathological anatomy – study of structural changes caused by disease • Radiographic anatomy – study of internal structures visualized by X ray • Molecular biology – study of anatomical structures at a sub-cellular level Physiology • Considers the operation of specific organ systems – Renal – kidney function – Neurophysiology – workings of the nervous system – Cardiovascular – operation of the heart and blood vessels • Focuses on the functions of the body, often at the cellular or molecular level Levels of Structural Organization Smooth muscle cell Molecules 2 Cellular level Cells are made up of molecules Smooth muscle tissue 3 Tissue level Tissues consist of similar types of cells Cardiovascular system Epithelial tissue Smooth muscle tissue Connective tissue 4 Organ level Organs are made up of different types of tissues Atoms 1 Chemical level Atoms combine to form molecules Heart Blood vessels Blood vessel (organ ) 6 Organismal level The human organism is made up of many organ systems 5 Organ system level Organ systems consist of different organs that work together closely Figure 1.1 Levels of Structural Organization (*VERY important*) • Chemical – atoms combined to form molecules • Cellular – cells are made of molecules • Tissue – consists of similar types of cells • Organ – made up of different types of tissues • Organ system – consists of different organs that work closely together • Organism – made up of the organ systems Homeostasis Imagine one day is very cold out, while the next day is very hot. What effect does that have on your body temperature? External environment – keeps changing Internal environment - remains stable. How? Body has “Homeostatic Mechanisms” Homeostasis • Homeostasis is the ability to maintain a relatively stable internal environment in an ever-changing outside world • The internal environment of the body is in a dynamic state of equilibrium • Chemical, thermal, and neural factors interact to maintain homeostasis Feedback Loops • The beginning of a reflex pathway is a disturbance in a controlled parameter called a stimulus • The stimulus is detected by a sensor (receptor) – continuously monitoring the environment – when a change is detected, it sends out a signal • The signal travels from the receptor to the control (integrating) center Feedback Loops • The control center evaluates the incoming signal, compares it to the homeostatic setpoint, and decides on the appropriate response • The control center sends out a signal to the effector • The effector is a cell or tissue that carries out the appropriate response to bring the parameter back to within normal limits (setpoint) Types of Feedback • Negative feedback – Most common – The effector removes the cause of imbalance – Ex. Body temperature, blood pH • Positive feedback – The effector reinforces the stimulus (does not stop it) – Ex. Blood clotting, labor Anatomical Position • Body erect • Feet slightly apart • Palms facing forward • Thumbs point away from body Figure 1.7a Directional Terms • Superior and inferior – toward and away from the head, respectively • Anterior and posterior – toward the front and back of the body • Medial, lateral, and intermediate – toward the midline, away from the midline, and between a more medial and lateral structure Directional Terms • Proximal and distal – closer to and farther from the origin of the body • Superficial and deep – toward and away from the body surface Directional Terms Table 1.1 Directional Terms Table 1.1 Regional Terms: Anterior View • Axial – head, neck, and trunk • Appendicular – appendages or limbs • Specific regional terminology Figure 1.7a Regional Terms: Posterior View Figure 1.7b Activity! • https://www.wisconline.com/learn/natural-science/lifescience/ap15305/anatomicalterminology-relative-position Anatomical Locations • • • • • • • • • • Abdominal: abdominal region Acromial: the point of the shoulder Antebrachial: forearm Antecubital: anterior surface of the elbow Axillary: armpit Brachial: upper arm Buccal: cheek of the face Calcaneal: heel of the foot Carpal: wrist Cephalic: head 24 Anatomical Locations • • • • • • • • • • • Cervical: neck Deltoid: round part of the shoulder Digital: fingers and toes Dorsum: back Femoral: thigh Frontal: forehead Gluteal: buttocks Hallux: big toe Inguinal: groin Lumbar: lower back Mammary: breast 25 Anatomical Locations • • • • • • • • • • Mental: chin Nasal: Nose Occipital: base of the skull Olecranal: elbow Oral: mouth Orbital: bony eye socket Otic: ear Palmar: palm of hand Patellar: Kneecap Pedal: Foot 26 Anatomical Locations • Pelvic: pelvis region • Perineal: area between anus and external genitals • Plantar: sole of foot • Pollex: thumb • Popliteal: behind the knee • Pubic: genital region • Sacral: lower back between the hips • Scapular: shoulder blade • Tarsal: ankle • Thoracic: chest • Vertebral: spine 27 Body Planes • Sagittal – divides the body into right and left parts • Midsagittal or medial – sagittal plane that lies on the midline • Frontal or coronal – divides the body into anterior and posterior parts • Transverse or horizontal (cross section) – divides the body into superior and inferior parts • Oblique section – cuts made diagonally Body Planes Figure 1.8 Anatomical Variability • Humans vary slightly in both external and internal anatomy • Over 90% of all anatomical structures match textbook descriptions, but: – Nerves or blood vessels may be somewhat out of place – Small muscles may be missing • Extreme anatomical variations are seldom seen Body Cavities Figure 1.9a Body Cavities • Dorsal cavity protects the nervous system, and is divided into two subdivisions – Cranial cavity is within the skull and encases the brain – Vertebral cavity runs within the vertebral column and encases the spinal cord • Ventral cavity houses the internal organs (viscera), and is divided into two subdivisions: - Thoracic and Abdominopelvic cavities Body Cavities Figure 1.9b Body Cavities • Thoracic cavity is subdivided into pleural cavities, the mediastinum, and the pericardial cavity – Pleural cavities – each houses a lung – Mediastinum – contains the pericardial cavity, and surrounds the remaining thoracic organs – Pericardial cavity – encloses the heart Body Cavities • The abdominopelvic cavity is separated from the superior thoracic cavity by the dome-shaped diaphragm • It is composed of two subdivisions – Abdominal cavity – contains the stomach, intestines, spleen, liver, and other organs – Pelvic cavity – lies within the pelvis and contains the bladder, reproductive organs, and rectum Ventral Body Cavity Membranes • Parietal serosa lines internal body walls • Visceral serosa covers the internal organs • Serous fluid separates the serosae (A serous membrane, especially one that lines the pericardial, pleural, and peritoneal cavities, enclosing their contents) Ventral Body Cavity Membranes Figure 1.10a Ventral Body Cavity Membranes Figure 1.10b Other Body Cavities • Oral and digestive – mouth and cavities of the digestive organs • Nasal –located within and posterior to the nose • Orbital – house the eyes • Middle ear – contain bones (ossicles) that transmit sound vibrations • Synovial – joint cavities Abdominopelvic Regions • Umbilical • Epigastric • Hypogastric • Right and left iliac or inguinal • Right and left lumbar • Right and left hypochondriac Figure 1.11a Organs of the Abdominopelvic Regions Figure 1.11b Abdominopelvic Quadrants • Right upper (RUQ) • Left upper (LUQ) • Right lower (RLQ) • Left lower (LLQ) Figure 1.12