lab 5 AP

Latissimus Dorsi Origin

Inferior angle of the scapula; Spinous processes of T7-T12; Inferior 3rd or 4th rib; Iliac crest of hip

Latissimus Dorsi Insertion + Action

Bicipital groove of humerus

ADDUCTION of arm; EXTENSION of arm; Rotation of shoulder joint

Trapezius Origin

Nuchal ligament; Superior Nuchal line; Spinous processes of C7-T12

Trapezius Insertion + Action

Spine of scapula; Acromion; Lateral third of clavicle

EXTENSION of neck; ELEVATION/DEPRESSION of scapula

Deltoid Origin

Clavicle (ANTERIOR HEAD); Acromion (LATERAL HEAD); Spine of Scapula (POSTERIOR HEAD)

Deltoid Insertion + Action

Tuberosity of humerus

ABDUCTION of arm; FLEXION of shoulder

Supraspinatus Origin

Supraspinous fossa; Superior side of spine of scapula

Supraspinatus Insertion + Action

Greater tubercle of humerus

ABDUCTION of arm (lateral raise); Stabilizes glenohumeral joint

Infraspinatus Origin

Infraspinatus fossa; Inferior side of spine of scapula

Infraspinatus Insertion + Action

Greater tubercle of humerus

External rotation of shoulder/arm; Stabilizes glenohumeral joint

Teres Minor Origin

Lateral border of scapula

Teres Minor Insertion + Action

Greater tubercle of humerus

External rotation of arm; Stabilizes glenohumeral joint

Brachioradialis Origin

Lateral supracondylar ridge of humerus

Brachioradialis Insertion + Action

Styloid process of radius

FLEXION of forearm; SUPINATION/PRONATION of forearm

Extensor Carpi Ulnaris Origin

Lateral epicondyle of humerus; Posterior border of ulna

Extensor Carpi Ulnaris Insertion + Action

Base of the fifth metacarpal (pinky)

EXTENDS WRIST; ADDUCTS WRIST

Flexor Carpi Radialis Origin

Medial epicondyle of humerus

Flexor Carpi Radialis Insertion + Action

Bases of 2nd and 3rd metacarpal bones

FLEXION of wrist; ABDUCTION of wrist

Pectoralis Major Origin

Anterior surface/medial half of clavicle; Anterior surface of sternum; Superior 6 costal cartilages; Aponeurosis of external oblique muscle

Pectoralis Major Insertion + Action

Lateral crest of bicipital groove

ADDUCTION of humerus; Medial rotation of humerus; FLEXION/EXTENSION of humerus

Pectoralis Minor Origin

3rd to 5th ribs

Pectoralis Minor Insertion + Action

Coracoid process of scapula

Anterior/Inferior movement of scapula; Elevate ribs

Acromiotrapezius Action

Adducts the scapula

Clavotrapezius

Arises from the back of the skull and middorsal line of the neck and inserts on the clavicle. Its action is to extend the humerus in a forward direction.

Spinodeltoid

Arises from the scapula spine and inserts on the proximal portion of the humerus. Flex the humerus and rotate it outward.

Clavodeltoid

Originates from the clavicle and inserts on the ulna. This muscle flexes the forearm.

BRACHIORADIALIS cat

EXTENSOR CARPI RADIALIS cat

Produce wrist extension and abduction

EXTENSOR CARPI ULNARIS

Pectoantebrachialis

Its origin is the manubrium of the sternum, and its insertion is in a flat tendon on the fascia of the proximal end of the ulna. Its action is to draw the arm towards the chest.

PECTORALIS MAJOR cat

PECTORALIS MINOR cat

Xiphihumeralis

Assists pectoralis minor to adduct arm.

Ulnar Nerve

Provides motor innervation to part of the forearm and majority of the hand.

Sciatic Nerve and Tibial Nerve

Provides motor innervation to the posterior compartment of the thigh.