Unit 3 - Thorax, Abdomen, Pelvis, and Perineum: Muscles of the Thoracic Wall (Ex. III) Flashcards Preview

Gross Anatomy '15 Ex. III > Unit 3 - Thorax, Abdomen, Pelvis, and Perineum: Muscles of the Thoracic Wall (Ex. III) > Flashcards

Flashcards in Unit 3 - Thorax, Abdomen, Pelvis, and Perineum: Muscles of the Thoracic Wall (Ex. III) Deck (7)
Loading flashcards...
1

middle scalene

O: transverse processes of C1 and C2; P tubercles of transverse processes of C3-C7
I: rib 1 P to groove for subclavian a.
Inn: direct branches from C and B plexuses (C3-C8)
A: w/ ribs mobile - raises upper ribs (inspiration); w/ ribs fixed - ipsilaterally laterally flexes C spine and bilaterally flexes neck

2

P scalene

O: P tubercles of transverse processes of C5-C7
I: outer surface of rib 2
Inn: direct branches from C and B plexuses (C3-C8)
A: w/ ribs mobile - raises upper ribs (inspiration); w/ ribs fixed - ipsilaterally laterally flexes C spine and bilaterally flexes neck

3

external intercostals

O: lower margin of rib
I: upper margin of next lower rib
**course obliquely forward and downward from costal tubercle to chondro-osseous junction**
Inn: 1st-11th intercostal nn.
A: raise ribs (inspiration); support intercostal spaces; stabilize chest wall

4

internal intercostals

O: lower margin of rib
I: upper margin of next lower rib
**course obliquely forward and upward from costal angle to sternum**
Inn: 1st-11th intercostal nn.
A: lower ribs (expiration); support intercostal spaces; stabilize chest wall

5

innermost intercostals

O: lower margin of rib
I: upper margin of next lower rib
**course obliquely forward and upward from costal angle to sternum**
Inn: 1st-11th intercostal nn.
A: lower ribs (expiration); support intercostal spaces; stabilize chest wall

6

transversus thoracis

O: sternum and xiphoid process (inner surface)
I: costal cartilage, inner surface of ribs 2-6
Inn: 2nd-6th intercostal nn.
A: weakly lowers ribs (expiration)

7

A scalene

O: A tubercles of transverse processes of C3-C6
I: scalene tubercle of rib 1
Inn: direct branches from C and B plexuses (C3-C8)
A: w/ ribs mobile - raises upper ribs (inspiration); w/ ribs fixed - ipsilaterally laterally flexes C spine and bilaterally flexes neck

Decks in Gross Anatomy '15 Ex. III Class (89):