Survey
* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project
Download Muscular System Gross Anatomy
Document related concepts
no text concepts found
Transcript
Skeletal Muscles: Head, Neck and Trunk Muscles 10-1 Muscles of the Neck Mylohyoid Deep Deeper Geniohyoid Hyoid bone Sternocleidomastoid Sternocleidomastoid Splenius capitis Trapezius Semispinalis capitis (cut) Splenius capitis (cut) Levator scapulae Clavicle Fig. 11.8 Anterolateral Neck Muscles • Sternocleidomastoid Fig. 11.10 Posterior Neck Muscles • Trapezius • One or both may contract 10-2 Muscles of Facial Expression Frontal belly of occipitofrontalis Temporalis Orbicularis oculi Levator labii superioris Zygomaticus Orbicularis oculi Levator labii superioris Masseter Zygomaticus Buccinator Orbicularis oris Orbicularis oris Depressor labii inferioris Depressor labii inferioris Platysma Platysma Fig. 11.2 Elevators • Levator labii superioris, Occipitofrontalis, Zygomaticus Depressors Other actions • Buccinator, Orbicularis oculi, Orbicularis oris • Depressor labii inferioris, Platysma 10-3 Muscles of Facial Expression Elevators • Levator labii superioris, Occipitofrontalis, Zygomaticus Depressors • Depressor labii inferioris, Platysma Other actions • Buccinator, Orbicularis oculi, Orbicularis oris 10-4 Muscles of Facial Expression Fig. 11.3 10-5 Muscles of Mastication Fig. 11.5 Temporalis: Major Muscles Origin - temporal lines of parietal Insertion - coronoid process • Temporalis and Masseter Masseter: Origin - zygomatic arch Insertion - lateral side of mandible 10-6 Hyoid Muscles Digastric Anterior belly Posterior belly Mylohyoid Mylohyoid Digastric Anterior belly Posterior belly Geniohyoid Hyoid bone Clavicle Fig. 11.8 Actions of hyoid muscles: move mandible and hyoid 10-7 Trunk Muscles - Muscles of Vertebral Column Deep Deeper Semispinalis Erector spinae Iliocostalis Longissimus Spinalis Multifidus Fig. 11.11 Superficial: • Erector spinae (Iliocostalis, Longissimus, Spinalis), Semispinalis, and Multifidus Deep: • Interspinalis Actions: • Extension, rotation, lateral flexion of the back 10-8 Muscles of Respiration Inspiration: • Diaphragm is primary muscle of inspiration (depresses floor of thoracic cavity) • External intercostals elevate ribs Fig. 11.13 Expiration: • Internal intercostals depress ribs 10-9 Trapezius Extend Head, Adduct, Elevate or Depress Scapula Latissimus Dorsi Extend, Adduct & Rotate Arm Medially Deltoid Abduct, Flex & Extend Arm Pectoralis Major Flexes, adducts & rotates arm medially Biceps Brachii Flexes Elbow Joint Triceps Brachii Extend Elbow Joint Rectus Abdominus Flexes Abdomen External Oblique Compress Abdomen Forearm Muscles • • • • • • Flexor carpi—Flexes wrist Extensor carpi—Extends wrist Flexor digitorum—Flexes fingers Extensor digitorum—Extends fingers Pronator—Pronates Supinator—Supinates Gluteus Maximus Extends & Rotates Thigh Laterally Rectus Femoris Flexes Thigh, Extends Lower Leg Gracilis Adducts and Flexes Thigh Sartorius Flexes Thigh, & Rotates Thigh Laterally Biceps Femoris Extends Thigh & Flexes Lower Leg Tibialis Anterior Dorsiflexes and Inverts Foot Gastrocnemius Plantar Flexes Foot & Flex Lower Leg Big Picture • Function of all three major types of muscle (skeletal, cardiac, smooth) is integral to function of the entire body • All three types of muscle tissue provide the movement necessary for survival • Relative constancy of the body’s internal temperature is maintained by “waste” heat generated by muscle tissue 10-26
Related documents