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Unit 2 > Muscles > Flashcards

Muscles Flashcards

1
Q

External Intercostal (Attachments, Actions, Innervation, Blood Supply)

A

attachments- from rib to rib oriented from superior-lateral to inferior-medial
actions- elevation of ribs
innervation- intercostal nerve
blood supply- anterior & posterior intercostal a.

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2
Q

Internal, Innermost Intercostal (Attachments, Actions, Innervation, Blood Supply)

A

attachments- from rib to rib oriented superior-medial to inferior-lateral
actions- depression of ribs
innervation- intercostal nerve
blood supply- anterior & posterior intercostal a.

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3
Q

Transversus Thoracis

A

attachments- from posterior sternum to costal cartilages
actions- depress ribs
innervation- intercostal nerves
blood supply- internal thoracic & anterior intercostal a.

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4
Q

Diaphragm

A

attachments- from 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 nerve
blood supply- musculophrenic, inferior phrenic, subcostal & lower posterior intercostal a.

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5
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 epigastric, inferior epigastric, subcostal, lower posterior intercostal, lumbar, superficial circumflex iliac & deep circumflex iliac a.

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6
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 epigastric, inferior epigastric, subcostal, lower posterior intercostal, lumbar, superficial circumflex iliac & deep circumflex iliac a.

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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 epigastric, inferior epigastric, subcostal, lower posterior intercostal, lumbar, superficial circumflex iliac & deep circumflex iliac a.

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8
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 epigastric, inferior epigastric

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9
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 a.

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10
Q

Cremaster

A

attachment- from the medial edge of the internal oblique to spermatic cord
actions- elevation of testis
innervation- genitofemoral nerve
blood supply- cremasteric a.

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11
Q

Conjoint tendon

A

a structure formed from the lower part of the common aponeurosis of the internal abdominal oblique and the transverse abdominal as it inserts into the crest of the pubis and pectineal line immediately behind the superficial inguinal ring

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12
Q

Two muscles of the pelvic diaphragm

A

Coccygeus, levator ani

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13
Q

Coccygeus

A

attachments- from ischial spine & sacrospinous ligament to coccyx
actions- supports & compresses posterior pelvic floor
innervation- ventral rami S4-5
blood supply- inferior gluteal, internal pudendal & inferior rectal a.

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14
Q

Levator ani

A

attachments- from pubic symphysis, obturator fascia & ischial spine to midline raphe & anococcygeal ligament
actions- supports pelvic viscera, & compresses rectum & vagina
innervation- pudendal nerve (inferior rectal branches) & S4
blood supply- inferior gluteal, internal pudendal, inferior rectal & inferior vesical a.

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15
Q

Bulbospongiosus

A

attachments- in male from median raphe & perineal body (central tendon) to surround bulb of penis; in female from the perineal body to surround vestibular bulb, vaginal orifice & clitoris
actions- in male empties urethra, maintains erection & contracts during ejaculation; in female constricts vaginal orifice & contributes to erection of clitoris
innervation- perineal branch of pudendal nerve
blood supply- internal pudendal a.

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16
Q

Sphincter ani externus

A

attachments- from perineal body (central tendon) to anococcygeal raphe
actions- closes anal canal & fixes perineal body
innervation- inferior rectal branch of pudendal nerve
blood supply- internal pudendal a.

17
Q

Male Perineal Muscles

A

Sphincter urethrae, deep transverse perineus

18
Q

Female Perineal Muscles

A

Compressor urethrae, sphincter urethrovaginalis

19
Q

Superficial transverse perineus

A

attachments- from ischial tuberosity to perineal body (central tendon)
actions- fixes perineal body
innervation- perineal branch of the pudendal nerve
blood supply- internal pudendal a.

20
Q

Sphincter urethrae

A

attachments- surrounds urethra
actions- compresses urethra
innervation- perineal branch of pudendal nerve
blood supply- internal pudendal a.

21
Q

Compressor urethrae

A

attachments- from the ischiopubic ramus to midline passing ventral to the urethra and inferior to the sphinchter urethrae (with a variable number of fibers fanning out medially to to reach the vagina in females and thus replacing the deep transverse perineus)
actions- compresses urethra
innervation- perineal branch of the pudendal nerve
blood supply- internal pudendal a.

22
Q

Sphincter urovaginalis

A

attachments- from perineal body, surrounds vagina & urethra to meet contralateral muscle inferior to compressor urethrea
actions- compresses urethra & vagina
innervation- perineal branch of the pudendal nerve
blood supply- internal pudendal a.

23
Q

Deep transverse perineus

A

attachments- from ischial tuberosity to perineal body (central tendon)
actions- fixes perineal body
innervation- perineal branch of pudendal nerve
blood supply- internal pudendal a.

24
Q

Inspiratory Muscles

A
  • Diaphragm
  • External intercostals
  • Internal intercostals (b/w costal cartilages)
25
Q

Forced Inspiratory Muscles

A
  • Sternocleidomastoid
  • Pectorals
  • Scalene
26
Q

Forced Expiratory Muscles

A
  • Internal intercostals (b/w rib shafts)

- Abdominal muscles

27
Q

Layers of Anterolateral Abdominal Wall Inferior to Umbilicus (Superficial to Deep)

A
  • Skin
  • Superficial fascia (Camper, Scarpa)
  • Investing fascia + abdominal muscles (Sup fascia, ext oblique, intermediate fascia, internal oblique, deep fascia, transversalis abdominis)
  • Transversalis fascia
  • Extraperitoneal fat
  • Parietal peritoneum

Unit 2 (8 decks)

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