5/21/2013. Muscle Anatomy. Thursday January, 24 th, Skeletal Muscle. Smooth Muscle. Cardiac Muscle
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1 Muscle Anatomy Thursday January, 24 th, 2013 Skeletal Muscle Cardiac Muscle Smooth Muscle 1
2 Smooth Muscle 1. Found in the walls of the digestive system, bladder, uterus and blood vessels 2. Involuntary contractions 3. Act slowly 4. Do not tire easily and can remain contracted for a long time Cardiac Muscle 1. Found only in the heart 2. Striated and branched cells 3. Involuntary contractions 4. Rhythmic contractions 2
3 Anatomy of Skeletal Muscle Each muscle consists of Connective tissue Skeletal muscle tissue Nerves Blood vessels 1. Connective Tissues Tendons recall from Skeletal System Attach muscle to bone Fascia skeletal muscles are separated from adjacent muscles and held in positions by these layers of dense connective tissues Fascia surround each muscle and may project beyond the end of its muscle fibers to form tendons Aponeuroses attach muscles to other muscles 3
4 1. Connective Tissues Epimysium separates entire muscle from other tissues, surrounds skeletal muscle Perimysium separates muscle tissue into smaller sections called fascicles Endomysium surrounds the individual muscle fibers 1. Connective Tissues 4
5 1. Connective Tissues Supports and protect muscle cells Form tendons Provide force for contractions Create areas for blood vessels and nerves to pass through 5
6 Muscle Fibers A skeletal muscle fiber is a single muscle cell Sarcolemma unique cell membrane of a muscle fiber Sarcoplasm cytoplasm of a muscle fiber Muscle Fibers 6
7 Muscle Fibers The sarcolemma forms tubes that travel into the sarcoplasm at right angles Transverse Tubules (T Tubules) Sarcoplasmic reticulum releases calcium ions during muscle contraction and absorb them during relaxation Muscle Fibers 7
8 Myofibrils Myofibrils are made of 2 types of protein molecules called myofilaments Thick myofilaments: Myosin Thin myofilaments: Actin Thick and thin myofilaments are organized into repeating units called sarcomeres 8
9 Sarcomeres Sarcomeres A closer look 9
10 10
11 Naming muscle groups Most skeletal muscles have names that describe some feature of the muscle Size: Vastus (huge); Maximus (large); Longus (long); Minimus (small); Brevis (short) Shape: Deltoid (triangular); Latissimus (wide); Teres (round); Trapezius (trapezoid like) Naming muscle groups Direction of fibers: Recuts (straight); Transverse (across); Oblique (diagonally); Orbicularis (round) Location: Pectoralis (chest); Gluteus (butt); Brachii (arm); Supra (above); Infra (below); Sub (under or beneath); Lateralis (lateral) 11
12 Naming muscle groups Origin and Insertion: Sternocleidomastoideus (origin on the sternum, clavivle, insertion on the mastoid process); Brachioradialis (origin on the brachium or arm, insertion on the radius) All of the Skeletal Muscles! abductor digiti minimi (in the hand), abductor digiti minimi (in the foot), abductor hallucis, abductor ossis metatarsi quinti, abductor pollicis brevis, abductor pollicis longus, adductor brevis, adductor hallucis, adductor longus, adductor magnus, adductor pollicis, anconeus, anterior scalene, articularis genus, biceps brachii, biceps femoris, brachialis, brachioradialis, buccinator, coracobrachialis, corrugator supercilii, deltoid, depressor anguli oris, depressor labii inferioris, digastric, dorsal interossei (in the hand), dorsal interossei (in the foot), extensor carpi radialis brevis, extensor carpi radialis longus, extensor carpi ulnaris, extensor digiti minimi, extensor digitorum, extensor digitorum brevis, extensor digitorum longus, extensor hallucis brevis, extensor hallucis longus, extensor indicis, extensor pollicis brevis, extensor pollicis longus, flexor carpi radialis, flexor carpi ulnaris, flexor digiti minimi brevis (in the hand), flexor digiti minimi brevis (in the foot), flexor digitorum brevis, flexor digitorum longus, flexor digitorum profundus, flexor digitorum superficialis, flexor hallucis brevis, flexor hallucis longus, flexor pollicis brevis, flexor pollicis longus, frontalis, gastrocnemius, geniohyoid, gluteus maximus, gluteus medius, gluteus minimus, gracilis, iliocostalis cervicis, iliocostalis lumborum, iliocostalis thoracis, illiacus, inferior gemellus, inferior oblique, inferior rectus, infraspinatus, interspinalis, intertransversi, lateral pterygoid, lateral rectus, latissimus dorsi, levator anguli oris, levator labii superioris, levator labii superioris alaeque nasi, levator palpebrae superioris, levator scapulae, long rotators, longissimus capitis, longissimus cervicis, longissimus thoracis, longus capitis, longus colli, lumbricals (in the hand), lumbricals (in the foot), masseter, medial pterygoid, medial rectus, middle scalene, multifidus, mylohyoid, obliquus capitis inferior, obliquus capitis superior, obturator externus, obturator internus, occipitalis, omohyoid, opponens digiti minimi, opponens pollicis, orbicularis oculi, orbicularis oris, palmar interossei, palmaris brevis, palmaris longus, pectineus, pectoralis major, pectoralis minor, peroneus brevis, peroneus longus, peroneus tertius, piriformis, plantar interossei, plantaris, platysma, popliteus, posterior scalene, pronator quadratus, pronator teres, psoas major, quadratus femoris, quadratus plantae, rectus capitis anterior, rectus capitis lateralis, rectus capitis posterior major, rectus capitis posterior minor, rectus femoris, rhomboid major, rhomboid minor, risorius, sartorius, scalenus minimus, semimembranosus, semispinalis capitis, semispinalis cervicis, semispinalis thoracis, semitendinosus, serratus anterior, short rotators, soleus, spinalis capitis, spinalis cervicis, spinalis thoracis, splenius capitis, splenius cervicis, sternocleidomastoid, sternohyoid, sternothyroid, stylohyoid, subclavius, subscapularis, superior gemellus, superior oblique, superior rectus, supinator, supraspinatus, temporalis, tensor fascia lata, teres major, teres minor, thoracis, thyrohyoid, tibialis anterior, tibialis posterior, trapezius, triceps brachii, vastus intermedius, vastus lateralis, vastus medialis, zygomaticus major, zygomaticus minor. 12
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