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61 Cards in this Set
- Front
- Back
External abdominal oblique origin
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external surfaces of 5th-12th ribs
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External abdominal oblique insertion
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linea alba
pubic tubercle anterior half of iliac crest |
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External abdominal oblique innervation
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motor fibers in T7-T12 and the iliohypogastric nerve
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External abdominal oblique action
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compresses and supports abdominal viscera
flexes and rotates trunk (from book) |
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Internal abdominal oblique origin
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thoracolumbar fascia
anterior two thirds of iliac crest connective tissue deep to lateral third of inguinal ligament |
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Internal abdominal oblique insertion
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inferior borders of 10-12th ribs
linea alba pecten pubis via conjoint tendon |
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Internal abdominal oblique innervation
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motor fibers in T7-T12
iliohypogastric nerve ilioinguinal nerve |
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Internal abdominal oblique action
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compresses and supports abdominal viscera, flexes and rotates trunk
(from book) |
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Transversus abdominis origin
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internal surfaces of 7-12 costal cartilages
thoracolumbar fascia iliac crest connective tissue deep to lateral third of inguinal ligament |
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Transversus abdominis insertion
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linea alba with aponeurosis of internal oblique
pubic crest pecten pubis via conjoint tendon |
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Transversus abdominis innervation
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motor fibers in T7-T12
iliohypogastric nerve ilioinguinal nerv |
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Transversus abdominis action
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compresses and supports abdominal vescera
(from book) |
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Rectus abdominis origin
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pubic symphysis and pubic crest
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Rectus abdominis insertion
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xiphoid process and 5-7 costal cartilages
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Rectus abdominis innervation
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T7-T11 and subcostal nerve
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Rectus abdominis action
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flexes trunk
compresses abdominal viscera stabilizes and controls tilt of pelvis (antilordosis) (from book) |
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pyramidalis origin
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pubic crest
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pyramidalis insertion
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linea alba
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pyramidalis innervation
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subcostal N
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pyramidalis action
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assists rectus abdominis muscle in flexion of vertebral column
draws down linea alba (from book) |
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psoas major origin
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transverse processes of lumbar vertebrae
sides of bodies of T12-L5 vertebrae and intervening vertevral discs |
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psoas major insertion
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by a strong tendon to lesser trochanter of femur
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psoas major innervation
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L2-L4
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psoas major action
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flexes the thigh and vertebral column
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psoas minor origin
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sides of T12-L1 vertebrae and intervertebral discs
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psoas minor insertion
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pectineal line
iliopectineal eminence via iliopectineal arch |
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psoas minor innervation
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L1
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psoas minor action
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flexes the vertebral column
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quadratus lomborum innervation
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T12-L4
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quadratus lumborum action
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stabilizes the 12th rib, also extends the vertebral column and bends the lumbar spine laterally
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iliacus origin
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superior two thirds of iliac fossa
ala of sacrum anterior sacro-iliac ligaments |
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iliacus insertion
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lesser trochanter of femur and shaft inferior to it
psoas major tendon |
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iliacus action
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- flexes the thigh
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iliacus innervation
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femoral n. (L2-L3)
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actions of abdominal muscles (from lecture)
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1. Flex the trunk
2. Tense the abdominal wall, increasing intra-abdominal pressure 3. Depress (lowers) the ribs 4. Stabilize the pelvis during walking |
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coccygeus origin
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ischial spine
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coccygeus insertion
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inferior end of sacrum and coccyx
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coccygeus innervation
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S4-S5
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coccygeus action
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support the coccyx and pull it forward after childbirth or defecation
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levator ani (puborectalis, pubococcygeus, and iliococcygeus) origin
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body of pubis
tendinous arch of obturator fascia ischial spine |
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levator ani (puborectalis, pubococcygeus, and iliococcygeus) insertion
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perineal body
coccyx anococcygeal ligament walls of prostate or vagina rectum anal canal |
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levator ani (puborectalis, pubococcygeus, and iliococcygeus) innervation
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(S3-S4) on its pelvic (superior) surface
inferior rectal nerve (S2-S4) on its perineal (inferior) surface |
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levator ani (puborectalis, pubococcygeus, and iliococcygeus) action
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supports the pelvic viscera, resists inferior thrust, and raises the pelvic floor as in forced exhalation, coughing, vomiting, urination, and when lifting heavy objects. In addition, the puborectalis increases the angle between the rectum and anal canal, thereby preventing defecation and maintaining bowel continence
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external anal sphincter innervation
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inferior rectal nerve
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external anal sphincter action
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constricts anal canal during peristalsis, resisting defecation
supports and fixes perineal body and pelvic floor (from book, not in notes) |
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external urethral sphincter action
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relaxes to allow urination to occur or when ejaculation of semen occurs
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superficial transverse perineal origin
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internal sufrace of ischiopubic ramus and ischial tuberosity
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superficial transverse perineal insertion
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inferior aspect of posterior border of perineal membrane to perineal body
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superficial transverse perineal innervation
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muscular (deep) branch of perineal nerve, branch of pudendal nerve (S2-S4)
(from book not in notes) |
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superficial transverse perineal action
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supports and fixes perineal body/pelvic floor to support abdominopelvic viscera
resist increased intrabdominal pressure (from book, not in notes) |
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ischiocavernosus origin
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internal surface of ischiopubic ramus and ischial tuberosity
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ischiocavernosus insertion
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inferior and medial aspects of crus
perineal membrane medial to crus |
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ischiocavernosus innervation
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muscular (deep) branch of perineal nerve, branch of pudendal nerve (S2-S4)
(from book not in notes) |
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ischiocavernosus action
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maintain an erection by compressing the veins which drain the corpora cavernosa (female and male)
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bulbospongiosus origin (male)
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median raphe on ventral surface of bulb of penis
perineal body |
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bulbospongiosus origin (female)
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perineal body
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bulbospongiosus insertion (male)
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perineal membrane
dorsal aspect of corpus spongiosum and corpora cavernosa fascia of bulb of penis |
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bulbospongiosus insertion (female)
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pubic arch
fascia of corpora cavernosa of clitoris |
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bulbospongiosus innervation
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muscular (deep) branch of perineal nerve, branch of pudendal nerve (S2-S4)
(from book not in notes) |
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bulbospongiosus action (male)
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aids in compressing (emptying) the urethra of urine or semen
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bulbospongiosus action (female)
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supports and fixes perineal body/pelvic floor
"sphincter" of vagina assists in erection of clitoris and bulb of vestibule compresses greater vestibular gland (from book, not in notes) |