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Gross Anatomy 2 > Exam 3 Muscles > Flashcards

Exam 3 Muscles Flashcards

1
Q

Origin: External Intercostal

A

Inferior border of rib

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2
Q

Insertion: External Intercostal

A

Superior border of ribs below

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3
Q

Innervation: External Intercostal

A

Intercostal Nerve

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4
Q

Main Action: External Intercostal

A

During forced inspiration: elevate ribs

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5
Q

Origin: Internal Intercostal

A

Inferior border of rib

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6
Q

Insertion: Internal Intercostal

A

Superior border of rib below

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7
Q

Innervation: Internal Intercostal

A

Intercostal Nerve

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8
Q

Main Action: Internal Intercostal

A

During forced inspiration: interosseous part depresses ribs; interchondral part elevates ribs

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9
Q

Origin: Innermost Intercostal

A

Inferior border of ribs

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10
Q

Insertion: Innermost Intercostal

A

Superior border of ribs below

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11
Q

Innervation: Innermost Intercostal

A

Intercostal Nerve

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12
Q

Main Action: Innermost Intercostal

A

During forced inspiration: interosseous part depresses ribs; interchondral part elevates ribs

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13
Q

Origin: Transverse Thoracic

A

Posterior surface of lower sternum

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14
Q

Insertion: Transverse Thoracic

A

Internal surface of costal cartilages 2-6

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15
Q

Innervation: Transverse Thoracic

A

Intercostal Nerve

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16
Q

Main Action: Transverse Thoracic

A

Weakly depresses ribs

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17
Q

Origin: External Oblique

A

External Surfaces of 5th-12th ribs

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18
Q

Insertion: External Oblique

A

Linea alba
Pubic tubercle
Anterior half of iliac crest

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19
Q

Innervation: External Oblique

A

Thoraco-abdominal Nerves (anterior rami T7-T11) and subcostal nerve

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20
Q

Main Action: External Oblique

A

Compress and support abdominal viscera

Flex and rotate trunk

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21
Q

Origin: Internal Oblique

A

Thoracolumbar Fascia
Anterior 2/3 or iliac crest
CT deep to inguinal ligament

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22
Q

Insertion: Internal Oblique

A

Inferior borders of 10th-12th ribs
Linea Alba
Pubis via conjoint tendon

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23
Q

Innervation: Internal Oblique

A

Thoraco-abdominal Nerves (anterior rami T7-T11), subcostal and 1st lumbar nerve

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24
Q

Main Action: Internal Oblique

A

Compress and support abdominal viscera

Flex and rotate trunk

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25
Q

Origin: Transversus Abdominis

A

Internal surfaces of 7th-12th costal cartilages, thoracolumbar fascia, iliac crest, CT deep to inguinal ligament

26
Q

Insertion: Transversus Abdominis

A

Linea alba with aponeurosis of internal oblique, pubic crest, and pubis via conjoint tendon

27
Q

Innervation: Tranversus Abdominis

A

Thoraco-abdominal Nerves (anterior rami T7-T11), subcostal and 1st lumbar nerve

28
Q

Main Action: Transversus Abdominis

A

Compresses and supports abdominal viscera

29
Q

Origin: Rectus Abdominis

A

Pubic symphysis and pubic crest

30
Q

Insertion: Rectus Abdominis

A

Xiphoid process and 5th-7th costal cartilages

31
Q

Innervation: Rectus Abdominis

A

Thoraco-abdominal and subcostal nerves (anterior rami of T7-T12 spinal nerves)

32
Q

Main Action: Rectus Abdominis

A 
Flexes trunk (lumbar vertebrae) and compresses abdominal viscera 
Stabilizes and controls tilt of pelvis (antilordosis)
33
Q

Origin: Psoas Major

A

Transverse processes of lumbar vertebrae; sides of bodies of T12-S1 vertebrae and intervening IV discs

34
Q

Insertion: Psoas Major

A

Lesser trochanter of femur

35
Q

Innervation: Psoas Major

A

Lumbar plexus via anterior branches of nerves L2-L4

36
Q

Main Action: Psoas Major

A

Acting inferiorly with iliacus: flexes thigh
Acting superiorly: flexes vertebral column laterally to balance the trunk
When sitting: acts inferiorly with iliacus to flex trunk

37
Q

Origin: Iliacus

A

Superior 2/3 of iliac fossa, ala of sacrum, and anterior sacro-iliac ligaments

38
Q

Insertion: Iliacus

A

Lesser trochanter of femur and shaft inferior to Psoas major tendon

39
Q

Innervation: Iliacus

A

Femoral nerve (L2-L4)

40
Q

Main Action: Iliacus

A

Flexes thigh and stabilizes hip joint

Acts with Psoas major

41
Q

Origin: Quadratus Lumborum

A

Medial half of inferior border of 12th rib and tips of lumbar transverse process

42
Q

Insertion: Quadratus Lumborium

A

Iliolumbar ligament and internal lip of iliac crest

43
Q

Insertion: Quadratus Lumborum

A

Iliolumbar ligament and internal lip of iliac crest

44
Q

Main Action: Quadratus Lumborum

A

Extends and laterally flexes vertebral column

Flexes 12th rib during inspiration

45
Q

Origin: Obturator Internus

A

Pelvic surface of the ilium and ischium

Obturator membrane

46
Q

Insertion: Obturator Internus

A

Greater trochanter of the femur

47
Q

Insertion: Obturator Internus

A

Nerve to Obturator Internus

48
Q

Main Action: Obturator Internus

A

Laterally rotates hip joint

Assists in holding head of femur in acetabulum

49
Q

Origin: Piriformis

A

Pelvic surface of 2nd-4th sacral segments
Superior margin of greater sciatic notch
Sacrotuberous ligament

50
Q

Insertion: Piriformis

A

Greater trochanter

51
Q

Innervation: Piriformis

A

Anterior rami of S1 and S2

52
Q

Main Action: Piriformis

A

Laterally rotates hip joint
Abducts hip joint
Holds head of femur in acteabulum

53
Q

Origin: Levator Ani

A

Body of pubis
Tendinous arch of levator ani
Ischial spine

54
Q

Insertion: Levator Ani

A 
Perineal body
Coccyx
Anococcygeal ligament 
Walls of prostate or vagina
Rectum
Anal canal
55
Q

Innervation: Levator Ani

A

Nerve to Levator Ani (branches of S4)
Inferior anal (rectal) nerve
Coccygeal plexus

56
Q

Main Action: Levator Ani

A

Helps support pelvic viscera

Resists increases in intra-abdominal pressure

57
Q

Origin: Coccygeous

A

Ischial spine

58
Q

Insertion: Coccygeous

A

Inferior end of sacrum and coccyx

59
Q

Innervation: Coccygeous

A

Branches of S4 and S5 nerves

60
Q

Main Action: Coccygeous

A

Forms small part of pelvic diaphragm that supports pelvic viscera
Flexes coccyx

Gross Anatomy 2 (10 decks)

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