ANAT 215 Lecture Notes - Lecture 14: Latissimus Dorsi Muscle, Triceps Brachii Muscle, Deltoid Tuberosity
ANAT 215 week 5 lecture 2
Upper limb compartments have their own muscle group, innervation, blood supply, function
Axial skeleton
to pectoral
girdle
Anterior
Origin= axial skeleton
Insertion= scapula
Function=pulls scapula fwd/protraction
Posterior
Origin= axial skeleton
Insertion= scapula
Function= retracts scapula
Trapezius which retracts scapula and causes elevation + depression
Axial skeleton
to arm
Anterior
Pectoralis major
Origin= ribs, sternum and clavicle
Insertion= onto lateral surface of proximal humerus
Function= abduct, medially rotate humerus + arm flexion
Posterior
Latissimus dorsi muscle (chin ups and swinging arms)
Origin= axial
Insertion= medial sirface of proximal humerus
Function= abducts, extends and medially rotates humerus
Pectoral girdle
to arm
Deltoid
(makes
shoulder
round)
Origin= clavicle, spine of scapula, acromion
Insertion= deltoid tuberosity of humerus
Function= abduction
Muscles of
arm
Anterior
(muscles
that flex
forearm)
Biceps brachii (C5-C6)
Origin= long head from scapula just above glenoid cavity+ short head
from coracoid process (heads merge to form fleshy belly tendon)
Insertion= tuberosity radius
Function= flexion of forearm at elbow when in supination due to its
insertion
Weak flexor of arm at shoulder b/c it crosses here
Posterior
(muscles
that extend
forearm)
Triceps brachii (C6-C8)
Origin= long head from scapula below glenoid cavity, lateral head
proximal surface of lateral humerus and medial head from posterior
surface of humerus
Insertion= olecranon
Function=extend forearm at elbow
3 head merge fleshy belly triceps tendon
Muscles of
forearm
Anterior
(flexor)
Origin= medial epicondyle of humerus spans out and down forearm
Insertion= carpal, metacarpal + middle phalanges
Function= flex hand at wrist and flex fingers (curls them)
Palmaris longus: ¼ muscles, long thin tendon, may be absent due to
disuse no longer do pullups
Pronator teres: associated w anterior flexor muscles but pronates hand
Posterior
6 superficial muscles
origin= lateral epicondyle
insertion= meta carpal, distal and middle phalanges
function= extends hand and fingers
Muscles that
sup/protonate
Biceps brachii
Pronator teres
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Upper limb compartments have their own muscle group, innervation, blood supply, function. Trapezius which retracts scapula and causes elevation + depression. Function= abduct, medially rotate humerus + arm flexion. Latissimus dorsi muscle (chin ups and swinging arms) Origin= long head from scapula just above glenoid cavity+ short head from coracoid process (heads merge to form fleshy belly tendon) Function= flexion of forearm at elbow when in supination due to its insertion. Weak flexor of arm at shoulder b/c it crosses here. Origin= long head from scapula below glenoid cavity, lateral head proximal surface of lateral humerus and medial head from posterior surface of humerus. Origin= medial epicondyle of humerus spans out and down forearm. Function= flex hand at wrist and flex fingers (curls them) Palmaris longus: muscles, long thin tendon, may be absent due to disuse no longer do pullups. Pronator teres: associated w anterior flexor muscles but pronates hand.