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Flashcards in Muscles of abdomen Deck (7)
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1
Q

Cremaster (G. kremaster, a suspender)

A

Attachments: from the medial edge of the internal oblique to spermatic cord

Actions: elevation of testis

Innervation: genitofemoral n.

Blood supply: cremasteric a.

2
Q

Diaphragm

A

Attachments: from the xiphoid process, inner surface of the lower ribs & costal cartilages, medial & lateral arcuate ligaments & lumbar vertebrae via the crura to the central tendon

Actions: inspiration (negative thoracic pressure by inferior displacement)

Innervation: phrenic n.

Blood supply: musculophrenic, inferior phrenic, subcostal & lower posterior intercostal aa.

3
Q

External oblique

A

Attachments: from lower 8 ribs to iliac crest & rectus sheath

Actions: flexion & rotation of the trunk, & compression of the abdominal cavity

Innervation: ventral rami T7-12

Blood supply: superior & inferior epigastric, subcostal, lower posterior intercostal, lumbar, superficial & deep circumflex iliac aa.

4
Q

Internal oblique

A

Attachments: from thoracolumbar fascia to inguinal ligament, iliac crest & rectus sheath

Actions: flexion & rotation of the trunk, & compression of the abdominal cavity

Innervation: lower thoracic & L1 ventral rami

Blood supply: superior & inferior epigastric, subcostal, lower posterior intercostal, lumbar, superficial & deep circumflex iliac aa.

5
Q

Quadratus lumborum

A

Attachments: from 12th rib to iliolumbar ligament & iliac crest

Actions: extension & lateral flexion of the trunk, and fixes 12th rib during respiration

Innervation: ventral rami T12-L3

Blood supply: subcostal, lumbar & iliolumbar aa.

6
Q

Rectus abdominis

A

Attachments: from xiphoid process & adjacent costal cartilages to pubic crest & tubercle

Actions: flexion of trunk & compression of abdominal cavity

Innervation: lower thoracic ventral rami

Blood supply: superior & inferior epigastric aa.

7
Q

Transversus abdominis

A

Attachments: from lower six costal cartilages & thoracolumbar fascia to inguinal ligament, iliac crest & rectus sheath

Actions: compression of the abdominal cavity

Innervation: lower thoracic & L1 ventral rami

Blood supply: superior & inferior epigastric, subcostal, lower posterior intercostal, lumbar, & superficial & deep circumflex iliac aa.