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Gross Anatomy '14 > Muscles: Test 3 > Flashcards

Muscles: Test 3 Flashcards

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0
Q

external intercostal insertion

A

superior border of ribs below

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1
Q

External intercostal origin

A

inferior border of ribs

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2
Q

external intercostal innervation

A

intercostal nerve

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3
Q

external intercostal action

A

during forced inspiration: ELEVATE ribs

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4
Q

internal & innermost intercostal origin

A

inferior border of ribs

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5
Q

internal & innermost intercostals insertion

A

superior border of ribs below

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6
Q

internal & innermost intercostal innervation

A

intercostal nerve

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7
Q

internal & innermost intercostal action

A

during forced respiration:
interosseus part– DEPRESSES ribs
interchondral part– ELEVATES ribs

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8
Q

transversus thoracis origin

A

posterior surface of lower sternum

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9
Q

transversus thoracis insertion

A

internal surface of costal cartilages 2-6

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10
Q

transversus thoracis innervation

A

intercostal nerve

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11
Q

transversus thoracis action

A

weakly depresses ribs

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12
Q

external oblique origin

A

external surfaces of 5th-12th ribs

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13
Q

external oblique insertion

A

linea alba, pubic tubercle, and anterior half of iliac crest

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14
Q

external oblique innervation

A

thoraco-abdominal nerves (anterior rami of T7-T11)

subcostal nerve

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15
Q

external oblique action

A

compress and support abdominal viscera

flex and rotate trunk

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16
Q

internal oblique origin

A

thoracolumbar fascia
anterior 2/3 of iliac crest
connective tissue deep to inguinal ligament

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17
Q

internal oblique insertion

A

inferior borders of 10th-12th ribs
linea alba
pubis via conjoint tendon

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18
Q

internal oblique innervation

A

thoraco-abdominal nerves (anterior rami of T7-T11)

subcostal and first lumbar nerve

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19
Q

internal oblique action

A

compress and support abdominal viscera

flex and rotate trunk

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20
Q

transversus abdominis origin

A

internal surfaces of 7th-12th costal cartilages
thoraco-lumbar fascia
iliac crest
connective tissue deep to inguinal ligament

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21
Q

transversus abdominis insertion

A

linea alba with aponeurosis of internal oblique
pubic crest
pubis via conjoint tendon

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22
Q

transversus abdominis innervation

A

thoraco-abdominal nerves (anterior rami of T7-T11)

subcostal and first lumbar nerve

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23
Q

transversus abdominis action

A

compresses and supports abdominal viscera

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24
rectus abdominis origin
pubis symphysis | pubic crest
25
rectus abdominis insertion
xiphoid process | 5th-7th costal cartilages
26
rectus abdominis innervation
thoraco-abdominal and subcostal nerves | anterior rami of T7-T12 spinal nerves
27
rectus abdominis action
``` flexes trunk (lumbar vertebrae) compresses abdominal viscera stabilizes and controls tilt of pelvis (antilordosis) ```
28
Psoas Major origin
transverse processes of lumbar vertebrae | sides of bodies of T12-S1 vertebrae & intervening IV discs
29
Psoas major insertion
by a strong tendon to lesser trochanter of femur
30
Psoas major innervation
lumbar plexus via anterior branches of nerves L2-L4
31
Psoas major action
acting inferiorly with iliacus: flexes trunk with sitting and flexes thigh acting superiorly: flexes vertebral column laterally to balance trunk
32
iliacus origin
superior 2/3 of iliac fossa ala of sacrum anterior sacro-iliac ligaments
33
iliacus insertion
lesser trochanter of femur shaft inferior to it | psoas major tendon
34
iliacus innervation
femoral nerve (L2-L4)
35
iliacus action
flexes thigh and stabilizes hip joint | acts with psoas major
36
quadratus lumborum origin
medial half of inferior border of 12th rib and tips lumbar transverse processes
37
quadratus lumborum insertion
iliolumbar ligament | internal lip of iliac crest
38
quadratus lumborum innervation
anterior branches of T12 | L1-L4 nerves
39
quadratus lumborum action
extends and laterally flexes vertebral column | fixes 12th rib during inspiration
40
crura of the diaphragm
musculotendinous bundles that arise from the anterior surfaces of the bodies of the superior 3 lumbar vertebrae, the anterior longitudinal ligament and IV discs Right- larger, arises from the L1-L3/L4 vertebrae Left- arises from L1-L2/L3
41
Levator ani origin
body of pubis tendinous arch of levator ani ischial spine
42
levator ani insertion
``` perineal body coccyx anococcygeal ligament walls of prostate or vagina rectum anal canal ```
43
levator ani innervation
nerve to levator ani (branches of S4) inferior anal nerve coccygeal plexus
44
levator ani action
helps support pelvic viscera | resists increases in intra-abdominal pressure
45
coccygeus origin
ischial spine
46
coccygeus insertion
inferior end of sacrum and coccyx
47
coccygeus innervation
branches of S4 and S5 nerves
48
coccygeus action
forms small part of pelvic diaphragm that supports pelvic viscera flexes coccyx
49
piriformis action
pelvic surface of 2nd-4th sacral segments superior margin of greater sciatic notch sacrotuberous ligament
50
piriformis insertion
greater trochanter of femur
51
piriformis innervation
anterior rami of S1 and S2
52
piriformis action
laterally rotates hip joint abducts hip joint assists in holding head of femur in acetabulum
53
obturator internus origin
pelvic surface of ilium and ischium | obturator membrane
54
obturator internus insertion
greater trochanter of femur
55
obturator internus innervation
nerve to obturator internus (L5,S1,S2)
56
obturator internus action
laterally rotates hip joint | assists in holding head of femur in acetabulum
57
tendinous arch of pelvic fascia
continuous bilateral band running from the pubis to the sacrum along the pelvic floor adjacent to the viscera
58
ischiocavernosus origin
lateral surface of ischiopubic ramus | ischial tuberosity
59
ischiocavernosus insertion
embraces crus of penis and clitoris, inserting onto inferior and medial aspects of crus and to perineal membrane medial to crus
60
ischiocavernosus innervation
muscular (deep) branch of perineal nerve | branch of pudendal nerve
61
ischiocavernosus action
maintains erection of penis or clitoris by compressing outflow veins and pushing blood from root of penis or clitoris into body
62
bulbospongiosus (male) origin
median raphe on ventral surface of bulb of penis and perineal body
63
bulbospongiosus (male) insertion
surrounds lateral aspects of bulb of penis and most proximal part of body of penis, inserting into perineal membrane. dorsal aspect of corpora spongiosum and cavernosa fascia of bulb of penis
64
bulbospongiosus (male) innervation
muscular (deep) branch of perineal nerve | branch of pudendal nerve (S2-S4)
65
bulbospongiosus (male) action
supports and fixes perineal body/pelvic floor compresses bulb of penis to expel last drops of urine/semen assists erection by compressing outflow via deep perineal vein and by pushing blood from bulb into body of penis
66
bulbospongiosus (female) origin
perineal body
67
bulbospongiosus (female) insertion
passes on each side of lower vagina, enclosing bulb and greater vestibular gland, inserts onto pubic arch and fascia of corpora cavernosa of clitoris
68
bulbospongiosus (female) innervation
muscular (deep) branch of perineal nerve | branch of pudendal nerve (S2-S4)
69
bulbospongiosus (female) action
"sphincter" of vagina assists in erection of clitoris compresses greater vesticular gland
70
superficial transverse perineal body origin
internal surfaces of ischiopubic ramus & ischial tuberosity | compressor urethrea portion only
71
superficial transverse perineal body insertion
passes along superior posterior border of perineal membrane to perineal body
72
superficial transverse perineal body innervation
muscular (deep) branch of perineal nerve terminal branch of pudendal nerve (S2-S4) dorsal nerve of penis of clitoris
73
External anal sphincter origin
skin and fascia surrounding anus and coccyx via anococcygeal ligament
74
External anal sphincter insertion
passes around lateral aspects of anal canal | inserting into perineal body
75
External anal sphincter innervation
inferior anal nerve | branch of pudendal nerve (S2-S4)
76
External anal sphincter action
constructs anal canal during peristalsis resists defecation supports and fixes perineal body/pelvic floor

Gross Anatomy '14 (4 decks)

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