Thoracoappendicula/Costals

Question 1

Pectoralis Major

Answer 1

PROX. ATTACHMENT
Sternum, costal cartilages (sternocostal head)
Medial clavicle (clavicular head)

DISTAL ATTACHMENT
Intertubercular groove (of humerus)

ACTION
ADD, Horizontal ADD, and IR
Flexion (only clavicular head)

INNERVATION
Lateral pectoral n
Medial pectoral n

Spinal or cranial levels of (named nerve)
C5-C6-C7
C8- T1

PARALLELING ARTERY
Pectoral branch of thoracoacromial trunk

Question 2

Pectoralis Minor

Answer 2

PROX. ATTACHMENT
Ribs 3-5

DISTAL ATTACHMENT
Coracoid process

ACTION
Downward rotation

INNERVATION
Medial pectoral n

Spinal or cranial levels of (named nerve)
C8- T1

PARALLELING ARTERY
Pectoral branch of thoracoacromial trunk

Question 3

Subclavius

Answer 3

PROX. ATTACHMENT
Rib 1 and 1st costal cartilage

DISTAL ATTACHMENT
Distal clavicle

ACTION
Depress

INNERVATION
Nerve to subclavius

Spinal or cranial levels of (named nerve)
C5-C6

Question 4

Serratus Anterior

Answer 4

PROX. ATTACHMENT
Ribs 1-8

DISTAL ATTACHMENT
Medial border of scapula

ACTION
Protraction
Hold scapula to body wall

INNERVATION
Long thoracic n

Spinal or cranial levels of (named nerve)
C5-C6-C7

PARALLELING ARTERY
Lateral thoracic a.

Question 5

External Intercostal (fibers anteroinferior)

Answer 5

PROX. ATTACHMENT
Inferior border of rib

DISTAL ATTACHMENT
Superior border of rib below

ACTION
Role in respiration (Inspiration)

INNERVATION
Intercostal n (& its collateral branch)

PARALLELING ARTERY
Posterior & anterior intercostal aa

Question 6

Internal Intercostal (fibers posteroinferior)

Answer 6

PROX. ATTACHMENT
Inferior border of rib

DISTAL ATTACHMENT
Superior border of rib below

ACTION
Role in respiration

INNERVATION
Intercostal n (& its collateral branch)

PARALLELING ARTERY
Posterior & anterior intercostal aa

Question 7

Innermost intercostal (fibers posteroinferior)

Answer 7

PROX. ATTACHMENT
Inferior border of rib

DISTAL ATTACHMENT
Superior border of rib below

ACTION
Role in respiration

INNERVATION
Intercostal n (& its collateral branch)

PARALLELING ARTERY
Posterior & anterior intercostal aa

Question 8

Subcostal (fibers posteroinferior)

Answer 8

PROX. ATTACHMENT
Inferior surface of rib

DISTAL ATTACHMENT
Superior border of rib 2-3 below

ACTION
Role in respiration

INNERVATION
Intercostal n (& its collateral branch)

PARALLELING ARTERY
Posterior & anterior intercostal aa

Question 9

Transversus Thoracis

Answer 9

PROX. ATTACHMENT
Posterior surface of sternum

DISTAL ATTACHMENT
Costal cartilages 2-6

ACTION
Role in respiration

INNERVATION
Intercostal n (& its collateral branch)

PARALLELING ARTERY
Anterior intercostal aa

Question 10

Sternocleidomastoid

Answer 10

PROX. ATTACHMENT
Manubrium (sternal head) Superior medial third of clavicle (clavicular head)

DISTAL ATTACHMENT
Mastoid process and lateral superior nuchal line

ACTION
B- extension of head on neck and flexion of neck
U- side bend neck ipsilateral and rotate chin contralateral

INNERVATION
CN XI spinal accessory n
Sensory: C3,C4

ARTERY
branch of the external carotid a

Question 11

Anterior Scalene muscle

Answer 11

PROX. ATTACHMENT
Transverse processes cervical vertebra C3-6

DISTAL ATTACHMENT
Rib 1, scalene tubercle

ACTION
Unilateral: lateral flexion neck
Bilateral: flexion of neck
Elevate the rib cage/ribs 1-2

INNERVATION
Ventral rami (C3-C6)

ARTERY
branch of ascending cervical a.

Question 12

Middle and Posterior Scalene muscle

Answer 12

PROX. ATTACHMENT
Transverse processes cervical vertebra C5-7

DISTAL ATTACHMENT
Rib 1-2

ACTION
Unilateral: lateral flexion neck
Bilateral: flexion of neck
Elevate the rib cage/ribs 1-2

INNERVATION
Ventral rami (C3-C8)

ARTERY
branch of ascending cervical a.