Anatomy Flashcards
What is the 2 anatomy structures of the pelvis & region
- True pelvis:
Inferior part of pelvic bones, sacrum & coccyx
Inlet & outlet - False pelvis:
Superior region of pelvic bone & lower lumbar vertebrae
Part of abdomen
What is the 3 cavities in the abdomen area
- Abdominal cavity
- Pelvic cavity
- Perineum
What is the 3 functions of the pelvis
- Weight bearing
- Support & protecting viscera
- Muscle attachment
What is the pelvic viscera
Reproductive organs, urinary bladder & rectum
Where is the connection between urinary & reproductive tract
Pelvic cavity
What does the perineum anchor
External genitalia
What is the 2 tissue types that root of external genitalia consist of
Erectile or vascular tissue
Skeletal muscle
What is another name for pelvic inlet
Pelvic brim
What anatomical landmark does the pelvic inlet divide
True & false pelvis
What 3 structures forms the pelvic walls
Bone, muscle & ligaments
What ligaments form the greater & lesser sciatic notches
Sacrospinous & sacrotuberous ligaments
What muscles is involved in forming the walls of the pelvic
Piriformis & obturator internus
Where can you find the piriformis muscle
Greater sciatic notch
Where can you find the obturator internus muscle
Lesser sciatic notch
What lines the superior aspect of pelvic viscera
Peritoneum
What is the shape of the pelvic outlet
Diamond shape
What 3 bones form the pelvic outlet
Pubic symphysis, ischial tuberosities & coccyx
What does the pelvic floor separate
Pelvic cavity from perineum
What is the muscles of the pelvic diaphragm
- 3 levator ani muscles: illicoccygeus, pubococcygeus & puborectalis muscles
- Coccygeus muscles
What is the 2 openings in the pelvic floor
- Urogenital hiatus
- Rectal hiatus
What is the perineal membrane
Thick triangular facial sheet
Where is the deep perineal pouch
Narrow region superior to perineal membrane
Where is the perineum located
Inferior to pelvic floor between lower limbs
Where is the line diving the 2 triangles
Between ischial tuberosity
What is the anterior & posterior triangles
Anterior urogenital triangle
Posterior anal triangle
What is the anatomical borders of the triangles (anterior, inferior & lateral)
Anterior pubic symphysis
Inferior tip of coccyx
Lateral ischiopubic rami & sacrotuberous ligament
What is the surface borders of the triangles (anterior, inferior & lateral)
Anterior mons pubis
Inferior intergluteal cleft
Lateral medial surface of thigh
In what planes are the urogenital & anal triangles
Urogenital horizontal plane
Anal tilted upwards & posteriorly
What is the ceiling of the anal triangle
Pelvic diaphragm
What is the major muscle of anal triangle
External anal sphincter
Where can you find the superficial perineal pouch
Urogenital triangle
Between perineal membrane & membranous layer or superficial fascia
What 2 tissues are found in urogenital triangle
Erectile tissue of penis/clitoris
Skeletal muscle
What is the 3 muscles of the penis
Ischiocavernosus, bulbospongiosus & superficial transverse perineal muscles
What is the major artery supplying blood to pelvis
Internal iliac artery
What is the flow of lymph in the pelvis
Drain into nodes associated with common iliac arteries into lateral aortic nodes associated w/ lateral surfaces of abdominal aorta into lumbar trunk then thoracic duct
What is the 2 innervations of the pelvic cavity
- Visceral innervation
- Somatic innervation
What is the 3 fibers of visceral innervation
Sympathetic, parasympathetic & visceral afferent fibers
What 2 structures does the visceral innervation innervate
Pelvic viscera & erectile tissue of perineum
What is the nerve of somatic innervation & the origin
Pudendal nerve
S2-4
What is the 4 reproductive structures
Gonads organs produce gametes & hormones
Ducts receive & transport gametes
Accessory glands secret fluid into ducts
Perineal structure known as external genitalia
What is the pathway of sperm
- Testes
- Epididymis
- Vas deference
- Seminal vesicles
- Prostate
- Bulbourethral gland
- Urethra
What is the scrotum
A fleshy pouch enclosing the testes inferior to perineum
What divides the testes into 2 chambers
Midline raphe
What is the 2 muscles of the scrotum
- Dartos muscle
- Cremaster muscle
What is the type of muscle & function of Dartos muscle
Smooth muscle in dermis
Wrinkling of scrotal surface
What is the type of muscle & function of Cremaster muscle
Skeletal muscle in deep dermis & extends to penis
Tenses scrotum & pulls testes up with decreased temperature & sexual arousal
What is the shape of the testes & to what do they attach
Ellipsis
Spermatic cord
What is the 2 layers that cover the testes
- Tunica vaginalis: serous membrane w/ parietal & visceral layers
- Tunica albuginae: dense layer of connective tissue rich in collagen that divides into lobules
What is the function of seminiferous tubules
Aids in production & maturation of sperm & testosterone
What is the flow of sperm from seminiferous tubules to epididymis
Seminiferous tubules to rete testes to efferent tubules and then epididymis for storage & maturation
What type of organ is the penis
Copulatory & urinary
What is the 3 parts of the penis
Root is fixed w/ 2 crura & bulb of penis
Body is free covered by skin & free parts of corpora
Head/glans expanded free end of corpus spongiosum (frenulum, corona, neck & prepuce)
What is the function of areolar tissue in the penis
Allow skin to move freely
What 3 structures does the subcutaneous layer of the penis contain
Superficial arteries, veins & lymphatics
What is the prepuce
Fold skin surround top of penis w/ glands
What does the prepuce glands secrete
Waxy material, smegma, that support bacterial growth
What is circumcision & 2 reasons why is it performed
Surgical removal
Preventive infection & penile cancer
Where is erectile tissue found
Body of penis
What is the 2 structures of the erectile tissue
- Corpora cavernousa
- Corpora spongiosum
What is the corpora cavernosa
Two cylindrical masses of erectile tissue encircled by dense collagenous sheath
What is the area called where diverge at the base of the penis
Crus
What is the extend of the corpora caverosa tissue
To the neck of the penis
What is the extend of the corpora spongiosum
Extends to the tips of penis
What is the corpora spongiosum
Slender erectile body that surrounds distal portion of urethra encircled w/ sheath of elastic fibers
What does the spermatic cord contain
Vas deference, blood vessels, nerves & lympathics
What is the path of the spermatic cord
Begin at entrance to inguinal canal, passage through abdominal musculature & descend into scrotum via superficial inguinal ring
What is the artery & vein blood supply
Deferential artery
Testicular artery
Pampiniform plexus of testicular vein
What is the nerve supply to the testes
Branched of genitofemoral nerve from lumbar plexus
What is the epididymis
A single coiled duct posterolateral sides of testes
What is the 3 parts of the epididymis
Head formed from efferent ducts from rete testis
Body heavily coiled ducts of epididymis
Tail distal & marks origin of vas deferens
What is the 4 function of epididymis
Sperm maturation
Transport sperm to vas deferens
Monitor & adjust composition of fluid produced by seminiferous tubules
Recycle damaged sperm
What is the vas deference
40-45cm part of spermatic cord duct that starts at tail of epididymis
What is the pathways of the vascular deference
Ascends through inguinal canal, curves inferiority along bladder towards prostate & seminal glands
Why does the vas deference contain smooth muscle
Peristaltic contraction to propel sperm & fluid
What is the 4 parts of the male urethra
Preprostatic, prostatic, membranous & spongy
What is the 4 functions of accessory glands
Activate sperm
Provide nutrients sperm need for motility
Propel sperm & fluids along reproductive tract (peristaltic contractions)
Produce buffers to counteract acidity of urethral & vaginal environments
What is the 3 accessory ducts of male reproductive tract
- Seminal vesicle
- Prostate gland
- Bulbourethral glands
What is the seminal vesicle
An outgrowth of vas deference & joins it to become ejaculatory duct
Where is the prostate gland located
Inferior to bladder, posterior to pubic symphysis & anterior to rectum
Where does the prostate gland open
Into the wall of prostatic urethra via 30-40 ducts
Where is the bulbourethral gland located & appearance
Deep perineal pouch
Small pea shaped mucous gland
Where does the bulbourethral gland open
Spongy urethra
What is the 2 functions for the bulbourethral gland
- Lubrication
- Pre-ejaculatory emission