Shoulder Joint Muscles Flashcards
The deltoid spans how many bones
2
The deltoid arises from
lateral spine of the scapula, passing across the acromion to the lateral third of the clavicle.
The deltoid distal attachment
deltoid tuberosity of the humerus
The deltoid distal attachment
deltoid tuberosity of the humerus
Anterior fibres of deltoid do what?
flex and medial rotate at the shoulder joint
The middle fibres of deltoid action
abduct the arm at the shoulder joint
The posterior fibres of deltoid action
extension and lateral rotation at the shoulder joint
Nerve supply to deltoid?
Axillary Nerve
In what common injury is this nerve often trapped and therefore damaged?
Shoulder Dislocation
The pectoralis major muscle origin
from the medial third of the clavicle, sternum and costal cartilage of the first 6 ribs and rectus sheath!
Distal attachment of pectoralis major muscle
the intertubercular lip/sulcus of the bicipital groove of the humerus
Pectoralis Major Muscle action
on the shoulder joint is to adduct the shoulder and medially rotate the humerus at the glenohumeral joint.
Pectoralis Minor action
stabilise scapula
Serrates Anterior inserts into
Scapula
Superior fibres of trapezius actions
elevates and rotates the scapula
