GA1 - OIANs

Question 1

Pec major origin

Answer 1

O: anterior surface of medial 1/2 of clavicle; anterior surface of sternum; costal cartilage of ribs 1-6, aponeurosis external oblique muscle

Question 2

Pec major insertion

Answer 2

I: lateral lip of intertubercular sulcus of humerus

Question 3

Pec major action

Answer 3

A: adductor and medially rotates humorous; draws scapula anteriorly and inferiorly

Question 4

Pec major nerve innervation

Answer 4

N: medial and lateral pectoral nn. (C5-T1)

• clavicular head: C5,C6
• sternocostal head: C7,C8,T1

Question 5

Pec major blood supply

Answer 5

Pectoral branch of thoracoacromial artery

Question 6

Pec minor origin

Answer 6

O: anterior surface of 3rd-5th ribs

Question 7

Pec minor insertion

Answer 7

I: medial border and superior surface coracoid process of scapula

Question 8

Pec minor action

Answer 8

A: stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall

Question 9

Pec minor nerve

Answer 9

N: medial pectoral nn. (C8-T1)

Question 10

Pec minor blood supply

Answer 10

Pectoral branch from thoracoacromial artery

Question 11

Serratus Anterior origin

Answer 11

O: external surfaces of lateral parts of 1-8 ribs

Question 12

Serratus Anterior insertion

Answer 12

I: anterior surface of medial border of scapula

Question 13

serratus anterior action

Answer 13

A: protracts scapula and keeps it against thoracic wall; rotation of scapula

Question 14

serratus anterior nerve

Answer 14

N: long thoracic n. (C5-C7)

Question 15

serratus anterior blood supply

Answer 15

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Question 16

subcalvian origin

Answer 16

O: junction of 1st rib and its costal cartilage

Question 17

subclavius insertion

Answer 17

I: inferior surface of middle third of clavicle

Question 18

subclavius action

Answer 18

A: anchors and depresses clavicle

Question 19

subclavius nerve

Answer 19

N: n to subvclavius (C5,C6)

Question 20

subclavius blood supply

Answer 20

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Question 21

external intercostal origin and insertion

Answer 21

O: inferior border of ribs
I: superior border of ribs below

Question 22

external intercostal action

Answer 22

Elevate ribs during forces inspiration

Question 23

external intercostal nerve

Answer 23

intercostal nerves

Question 24

external intercostal blood supply

Answer 24

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Question 25

transversus thoracis origin

Answer 25

Posterior surface of lower sternum

Question 26

transversus thoracis insertion

Answer 26

internal surface of costal cartilages 2-6

Question 27

transverse thoracis action

Answer 27

Weakly depresses ribs (expiration). Proprioception?

Question 28

transverse thoracis nerve

Answer 28

intercostal nerves 2-7

Question 29

transverse thoracis blood supply

Answer 29

l

Question 30

Internal/innermost intercostals origin and insertion

Answer 30

O: inferior border of ribs
I: superior border of ribs below

Question 31

Internal/innermost intercostals action

Answer 31

DURING ACTIVE RESPIRATION:
Interosseous: depresses ribs
Interchondral: elevates ribs

Question 32

Internal/innermost intercostals nerve

Answer 32

intercostal n. 1-11

Question 33

Internal/innermost intercostals blood supply

Answer 33

l

Question 34

subcostal origin and insertion

Answer 34

O: Internal surface of lower ribs near their angles
I: superior borders of 2-3 ribs below

Question 35

subcostal action

Answer 35

DURING ACTIVE RESPIRATION:
Interosseous: depresses ribs
Interchondral: elevates ribs

Question 36

subcostal nerve

Answer 36

variable lower intercostal n.

Question 37

subcostal blood supply

Answer 37

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