Upper Extremity Myology: Thoracoappendicular Muscles

Question 1

Pectoralis major m.

Answer 1

Insertion: Lateral lip intertubicular groove of humerus

Action: Adduct and Medially Rotate Humerus
CH: Flexes Humerus
SH: Extends Humerus

Innervation: Medial and lateral pectoral nerves

Blood Supply: Pectoral branch of thoracoacromial trunk

Question 2

Pectoralis minor m.

Answer 2

Insertion: Corocoid process of scapula
Action: Stabilize Scapula
Innervation: Medial pectoral n.
Blood Supply: Pectoral branch of thoracoacromial trunk

Question 3

Subclavius m.

Answer 3

Insertion: Inferior aspect of middle 1/3 of clavicle
Action: Stabilizes and depresses clavicle
Innervation: N. to subclavius
Blood Supply: Clavicular Branch of thoracoacromial trunk

Question 4

Serratus anterior m.

Answer 4

Insertion: Vertebral border of scapula
Action: Protract and retract scap and holds scap against thorax

Innervation: Long thoracic n.
Blood supply: Lateral thoracic n.