ANATOMY LAB MODULE 7: MOINA OF THE THORAX, ABDOMEN AND PERINEUM

LKMA, RJV

What is the origin of the external intercostal?

Inferior Ribs

What is the insertion of the external intercostal

Superior rib of the rib below

What is the innervation of the external intercostal

Intercostal nerve

What is the action of the external intercostal

With 1st rib fixed, they raise

ribs during inspirations and

thus increase anteroposterior

and transverse diameters of

thorax

What is the origin of the internal intercostal

Inferior rib

What is the insertion of the internal intercostal

superior rib of the rib below

What is the innervation of the internal intercostal

intercostal nerve

What is the action of the internal intercostal

With last rib fixed by abdominal

muscles, they lower ribs during

expiration

What is the origin of the innermost intercostal

adjacent rib

what is the insertion of the innermost intercostal

adjacent rib

What is the nerve of the innermost intercostal

intercostal nerve

What is the action of the innermost intercostal

assist external and internal intercostal muscles

What is the origin of the diaphragm

Xiphoid Process; lower six

costal cartilages, first three

lumbar vertebrae

What is the insertion of the diaphragm

central tendon

What is the innervation of the diaphragm

phrenic nerve

What is the action of the diaphragm

important muscle of

inspiration, increases vertical

diameter of thorax by pulling

central tendon downward;

assist in raising lower ribs also

used in abdominal straining

and weight lifting

What is the origin of the levatores costarum

Tip of transverse process of C7 and T1-T11

What is the insertion of the levatores costarum

Rib Below

what is the innervation of the levatores costarum

posterior rami of thoracic spinal nerves

what is the action of the levatores costarum

raises ribs therefore inspiratory muscles

what is the origin of the serratus posterior superior

lower cervical and upper thoracic spines

what is the insertion of the serratus posterior superior

upper ribs

what is the innervation of the serratus posterior superior

intercostal nerves

what is the action of the serratus posterior superior

raises ribs therefore inspiratory muscles

what is the origin of the serratus posterior inferior

upper lumbar and lower thoracic spines

what is the insertion of the serratus posterior inferior

lower ribs

what is the innervation of the serratus posterior inferior

intercostal nerves

what is the action of the serratus posterior inferior

depressed ribs therefore expiratory muscles

what is the origin of the external oblique

lower eight ribs

what is the insertion of the external oblique

Xiphoid process, linea alba,

pubic crest, pubic tubercle, iliac

crest

what is the innervation of the external oblique

Lower six thoracic nerves and

Iliohypogastric and ilioinguinal

nerves (L1)

what is the action of the external oblique

Supports abdominal contents;

compresses abdominal

contents; assist in flexion and

rotation of trunk assist in

forced expiration, micturition,

defecation, parturition and

vomiting

what is the origin of the internal oblique

Lumbar fascia, iliac crest, lateral

two thirds of inguinal ligament

what is the insertion of the internal oblique

Lower three ribs and costal

cartilages, xiphoid process, linea

alba, symphysis pubis

what is the innervation of the internal oblique

Lower six thoracic nerves and

Iliohypogastric and ilioinguinal

nerves (L1)

what is the action of the internal oblique

Supports abdominal contents;

compresses abdominal contents;

assist in flexion and rotation of

trunk assist in forced expiration,

micturition, defecation, parturition,

and vomiting

what is the origin of the transversus abdominis?

Lower six costal cartilages,

lumbar fascia, iliac crest, lateral

third of inguinal ligament

what is the insertion of the transversus abdominis?

xiphoid process, linea alba, symphysis pubis

what is the innervation fo the transversus abdominis

Lower six thoracic nerves and

iliohypogastric and ilioinguinal

nerves (L1)

what is the action of the transversus abdominis?

compresses abdominal contents

what is the origin of the rectus abdominis

Symphysis pubis and pubic

crest

what is the innervation of the rectus abdominis

lower six thoracic nerves

what is the innervation of the rectus abdominis

lower six thoracic nerve

what is the action of the rectus abdominis

compresses abdominal contents and flexes vertebral column; accessory muscle of expiration

What is the origin of the pyramidalis?

Anterior surface of pubis

What is the insertion of the pyramidalis

Linea Alba

What is the action of the pyramidalis

Tenses the linea alba

What is the innervation of the pyramidalis

12th thoracic nerve

What is the origin of the quadratus lumborum

Iliolumbar ligament, iliac

crest, tips of transverse

processes of lower lumbar

vertebrae

What is the insertion of the quadratus lumborum

12th rib

What is the action of the quadratus lumborum

Fixes 12th rib during

inspiration; depresses 12th rib

during forced expiration;

laterally flexes vertebral

column same side

What is the innervation of the quadratus lumborum

Lumbar Plexus

What is the origin of the bublospongiosus female

Central Tendon of Perineum

what is the insertion of the bublospongiosus female

Base of Clitoris

what is the innervation of the bublospongiosus female

pudendal nerve

what is the action of the bublospongiosus female

erects clitoris

What is the origin of the bublospongiosus male

Central tendon of

perineum and median raphe

of penis

What is the insertion of the bublospongiosus male

Dorsal Surface of Penis and bulb of penis

What is the innervation of the bublospongiosus male

pudendal nerve

What is the action of the bublospongiosus male

Constricts urethra; erects penis

What is the origin of the coccygeus

ischial spine

What is the insertion of the coccygeus

coccyx

What is the action of the coccygeus?

Elevates and supports pelvic floor

what is the innervation of the coccygeus

s3 and s4

What is the origin of the ischiocavernosus

ischial ramus

what is the innervation of the ischiocavernosus

perineal nerve

what is the insertion of the ischiocavernosus

corpus cavernosum

what is the action of the ischiocavernosus

compresses base of penis or clitoris

what are the levator ani muscles?

pubococcygeus

iliococcygeus

puboanalis

What is the origin of the pubococcygeus

posterior pubis and ischial spine

what is the insertion of the pubococcygeus

sacrum and coccyx

what is the action of the pubococcygeus

elevates anus; supports pelvic area

what is the innervation of the pubococcygeus

fourth sacral

What is the origin of the iliococcygeus?

ischial spine and tendinous arch of levator ani

What is the insertion of the iliococcygeus?

Coccyx, iliococcygeal raphe

and anococcygeal ligament

What is the innervation of the iliococcygeus?

Nerve to levator ani muscle (s3-s4)

What is the action of the iliococcygeus?

Provides structural support to

adjacent pelvic structure; fecal

continence

What is the origin of the puboanalis?

Posterior aspect of body of

pubis

What is the insertion of the puboanalis?

Fibers surround posterior

aspect of anorectal junction

What is the innervation of the puboanalis?

Nerve to levator ani muscle

(S3-S4); inferior anal and

perineal nerves

What is the action of the puboanalis?

Provides structural support to

adjacent pelvic structures;

fecal continence

What is the action of the external anal sphincter?

Keeps orifice of anal canal

closed

What is the origin of the external anal sphincter

coccyx

what is the insertion of the external anal sphincter

central tendon of perineum

what is the innervation of the external anal sphincter?

fourth sacral and pudenda

What is the action of the external urethral sphincter

constricts urethra

what is the insertion of the external urethral sphincter

median raphe

what is the origin of the external urethral sphincter?

pubic ramus

what is the innervation of the external urethral sphincter?

pudendal nerve

what is the insertion of the transverse perinei?

Deep: Median Raphe

Superficial: Central Perineal

What is the origin of the transverse perinei?

Deep and Superficial: Ischial Ramus

what is the innervation of the transverse perinei?

deep and superficial: pudendal

What is the action of the transverse perinei

Deep: Support pelvic floor

Superficial: Fixes central

tendon