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Pectoral Muscles
Origins, insertions, innervation, action, and blood supply of Pectoral muscles
20
Anatomy
Graduate
09/11/2011

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Term
Pectoralis major: origin
Definition
clavicular head: anterior surface of medial half of clavicle
sternocostal head: anterior sternum, upper six costal cartilages, aponeurosis of external oblique muscle
Term
Pectoralis major: insertion
Definition
lateral lip of intertubercular sulcus of humerus (crest of greater tubercle)
Term
Pectoralis major: innervation
Definition
later and medial pectoral nn.
(clavicular head: C5,C6
sternocostal head: C7,C8,T1)
Term
Pectoralis major: action
Definition
adducts, medially rotates, flexes/extends arm
Term
Pectoralis major: blood supply
Definition
pectoral branch of thoracoacromial a.,
perforating branches of internal thoracic a.
Term
Pectoralis minor: origin
Definition
anterior surface of ribs III-V
Term
Pectoralis minor: insertion
Definition
medial surface of coracoid process
Term
Pectoralis minor: innervation
Definition
medial pectoral n. (C8,T1)
Term
Pectoralis minor: action
Definition
stabilizes scapula by pulling it inferiorly and anteriorly
Term
Pectoralis minor: blood supply
Definition
thoracoacromial a.,
intercostal branches of internal thoracic a.
Term
Subclavius: origin
Definition
junction of rib I and its costal cartilage
Term
Subclavius: insertion
Definition
groove on inferior surface of middle 1/3 of clavicle
Term
Subclavius: innervation
Definition
subclavian n. (C5,C6)
Term
Subclavius: action
Definition
depresses clavicle down and forward
Term
Subclavius: blood supply
Definition
clavicular branch of thoracoacromial a.
Term
Serratus anterior: origin
Definition
external surfaces of lateral parts of ribs I-VIII
Term
Serratus anterior: insertion
Definition
anterior surface of medial border of scapula
Term
Serratus anterior: innervation
Definition
long thoracic n. (C5,C6,C7)
Term
Serratus anterior: action
Definition
abducts and protracts scaupla, rotates it so that glenoid cavity faces upwards;
also holds scapula firmly against thoracic wall
Term
Serratus anterior: blood supply
Definition
lateral thoracic a.
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