ANP1111 Lecture 10 Muscles Part 2 PDF

Chapter 10 (continued!) http://en.wikibooks.org/wiki/Human_Physiology/The_Muscular_System 5.10 Muscles Crossing the Shoulder & Elbow Joints biceps brachii (coracoid process & glenoid cavity to radius): anterior, flexes elbow joint & supinates forearm; weak flexor of arm at shou...

Chapter 10 (continued!) http://en.wikibooks.org/wiki/Human_Physiology/The_Muscular_System 5.10 Muscles Crossing the Shoulder & Elbow Joints biceps brachii (coracoid process & glenoid cavity to radius): anterior, flexes elbow joint & supinates forearm; weak flexor of arm at shoulder brachialis (humerus to ulna): immediately deep to biceps brachii; major forearm flexor (strong) – lifts ulna as biceps lifts radius ʘ brachioradialis (humerus to radius): superficial; from distal humerus to distal forearm; synergist in forearm flexion especially when forearm is semi-pronated Fig. 10.15 ʘ triceps brachii (scapula/humerus to ulna): only muscle of posterior compartment of arm; powerful forearm extensor, may help stabilize shoulder joint Fig. 10.15 brachioradialis Triceps brachii Fig. 10.15 Anterior Posterior 8. Muscles of the Forearm: Movements of the Wrist, Hand & Fingers 2 functional groups allow for movements of (i) the wrist and of (ii) the fingers and thumb pronator teres (humerus/ulna to lateral radius): pronates forearm, weak flexor of elbow flexor retinaculu flexor carpi radialis (humerus to m metacarpals): diagonally across forearm, powerful flexor of wrist; abducts hand ʘ flexor carpi ulnaris (humerus/ulna to metacarpals): powerful flexor of wrist; also adducts hand in concert with extensor carpi ulnaris; stabilizes wrist during finger Fig 10.16a Anterior & Superficial extension  ʘ flexor digitorum superficialis (humerus/ulna to phalanges): 2-headed, deeper; flexes wrist & middle phalanges of fingers 2-5 Fig 10.16b – Anterior & Superficial Muscles Removed Flexor carpi ulnaris Flexor digitorum superficialis  extensor carpi radialis longus/brevis (humerus to metacarpals): extends & abducts wrist extensor digitorum (lateral epicondyle of humerus to phalanges): prime mover of finger extension; extends wrist, can abduct fingers supinator (lateral epicondyle of humerus & proximal ulna to radius): deep so not seen here; assists biceps brachii to supinate forearm 10.17a Posterior & Superficial  Fig. 10.19: Anterior Views of Right Hand to give you an appreciation of the complexity that allows for precise fine motor control Fig. 10.4 bottom half 9. Muscles of Hip, Thigh & Leg ʘ iliopsoas (iliac crest & lumbar vertebrae to femur): composite of 2 muscles; prime mover of hip flexion (iliac spine to medial tibia): strap-like; longest ʘ sartorius muscle; flexes & laterally rotates thigh; weak knee flexor adductors (magnus, longus, brevis) (pubis to femur): all adduct, flex, medially rotate thigh – eg: riding a horse, walking, iliopsoas sartorius  pectineus (pubis to femur): adducts, flexes & medially rotates thigh gracilis (pubis to medial tibia): adducts thigh, medially rotates leg (walking) ʘ rectus femoris (iliac spine to patella & tibia): extends knee; flexes thigh at hip vastus (lateralis, medialis, intermedius): all extend the knee only (originate on femur) ʘ tibialis anterior (tibia to tarsals): prime mover of dorsiflexion; inverts foot rectus femoris tibialis anterior Figs. 10.20  Fig. 10.24 tibialis anterio r extensor digitoru m longus Fig. 10.22 Fig. 10.23 Extensor digitorum longus  Fig.10.5 gluteus maximus (ilium/sacrum to femur): largest & most superficial buttock muscle; major thigh extensor - climbing stairs, running, (site of im injection) gluteus medius (ilium to femur [laterally, greater trochanter]): abducts & medially rotates thigh; esp. during walking (also OK for im injections) Fig. 10.21  Fig. 10.23 Fig. 10.24 ʘ gastrocnemius (femur to calcaneal tendon): plantar flexes foot when knee extended; flex knee if foot dorsiflexed soleus (proximal tibia/fibula to calcaneus): deeper, plantar flexes ankle: walking, running, dancing ʘ fibularis (peroneus) longus (fibula under foot to 1st metatarsal): plantar flexes & everts foot;helps keep foot flat on ground calcaneal (Achilles tendon): largest tendon in body (G & S) gastrocnemius fibularis longus Fig. 10.25