ANAT 215 Lecture Notes - Lecture 14: Latissimus Dorsi Muscle, Triceps Brachii Muscle, Deltoid Tuberosity
28 Apr 2018
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Department
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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
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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.
