Muscle Groups

Question 0

Shoulder muscle continued next 4 muscles

Answer 0

All work together for shoulder
All cross shoulder joint
DELTOID : scap spine Acromium process and clav./ lat surface of humerus. Crosses shoulder, job- flexes sh plus horiz.flex assist, medial rot, abduct sh, extend sh and assists lateral rot.
PECS MAJOR : clav, sternum and rib cartilage 1-6/ top lateral surface of humerus. Crosses shoulder. Job- horiz flex sh. Adduct sh. Medial rot sh.
LATS DORSI: T7-12, iliac crest,lower ribs, bottom edge scap/ top anterior surface humerus. Crosses shoulder. Job- add sh., ext sh. Help rot sh. Depress sh girdle by pulling down on humerus
TERES MAJOR: lower post.surface scap/top ant.surface humerus. Crosses shoulder. Job - add sh., ext. shoulder, med rot help.

Question 1

Shoulder girdle muscles first 5 of 9

Answer 1

First 5 work together
TRAPS: crosses verts and AC joint - operates shoulder press
RHOMBOIDS: slightly lower - verts and midline border of scapula - operates lat pull down
SERRATUS ANTERIOR: front of ribs and midline scap surface - operates as in upwards rotation as in shoulder press as well as
traps
PECS MINOR: front ribs and coracoid process of scap - protracts sh girdle, downwards rot eg lat pull down as well also elevate rib cage in deep inhalation
LEVATOR SCAPULAE : verts plus back upper inner edge scap - elevates scap, down rot of scap eg lat pull down, lat flex neck

Question 2

Rotator cuffs

Answer 2

Shoulder stabilisation. All cross shoulder joint

SUPRASPINATUS above scap spine to top surface head of humerus. Job top but of sh abd. Stops downward dislocation, holds ball in socket
INFRASPINATUS post surface of scap to top lateral surface head of humerus. Job lateral rot of sh, holds ball in socket
TERES MINOR lower post scap surface to top,lateral surface head of humerus. Job lateral rot sh., hold ball in socket
SUBSCAPULARIS anterior scap surface to top anterior surface head of humerus. Job. Medial rot of sh. Holds ball in socket

Question 3

Group of shoulder girdle muscles - 5

Answer 3

Traps
Rhomboids
Serratus Anterior
Pecs minor
Levator scapulae

All cross AC joint
Lots of overlap of jobs eg elevation, retraction, depression, rotation, flex neck laterally

Question 4

Group of shoulder muscles - 4

Answer 4

Deltoid a
Pecs major
Last dorsi
Teres major

All cross shoulder
Jobs flex, abduct, rotate, adduct, extend, depress, some overlap.