Final Lecture Questions (Pelvic cavity, thoracic wall, respiratory, heart, etc.) Flashcards
What is the function of the pelvic cavity?
-Contains and supports the urinary bladder, rectum, anal canal, and reproductive tracts
-Contains most of the reproductive tracts in women and part of the reproductive tracts in men
What are the contents of the pelvic cavity in women?
-Fallopian/uterine tube
-Ovary
-Uterus
-Bladder
-Vagina
-Urethra
-Ureter
-Internal iliac artery/veins
-Rectum
-Anal canal
-Anal aperture
What are the contents of pelvic cavity in men?
-Ductus deferens
-Seminal vesicle
-Prostate
-Ejaculatory duct
-Rectum
-Anal canal
-Anal aperture
-Bladder
-Urethra
How many parts are there in the male urethra?
4 parts
What triangles are there in the pelvis?
-Anal triangle of perineum
-Urogenital triangle of perineum
What is the sacrum? What does it articulate with?
-Formed by the fusion of the five sacral vertebrae
-The base of the sacrum articulates with L5
-The apex articulates with the coccyx
What part of the sacrum projects into the pelvic inlet?
Promontory
What does the lumboscaral joint consist of?
-Formed by L5 and the sacrum
-2 facet joints (zygapophysial joints)
-An intervertebral disc that joins the body of L5-S1
-Stabilized by iliolumbar ligament, lumbosacral ligament, and anterior longitudinal ligament
What movements do the lumbosacral ligaments stabilize?
They stabilize all movements of L5-S1
What is the sacroiliac joint? What does it consist of?
-Synovial joints between the L-shapes articular facets on the lateral surfaces of the sacrum & facets on the iliac parts of the pelvic bones
-Anterior sacro-iliac ligament
-Interosseous sacro-iliac ligament
-Posterior sacro-iliac ligament
Which is the largest and strongest of the sacro-iliac ligaments?
Interosseous sacro-iliac ligament
What happens to the sacro-iliac joint as we age?
It becomes a fibrous joint, and can completely ossify
What does the pubic symphysis joint consist of ?
-Lies anteriorly between the adjacent surfaces of the pelvic bones
-Joint surfaces are covered by cartilage
-Can sometimes become fibrous or ossified
What ligaments stabilize the pubic symphysis joint?
-Superior pubic ligament
-Inferior pubic ligament
-These ligaments stabilize the pubic symphysis during childbirth
What are the muscles that make up the lateral pelvic wall?
-Obturator internus
-Piriformis
What nerve roots form the sacral & coccygeal plexuses? Where is it located?
-Situated on the posterolateral wall of the pelvic cavity
-Posterior to internal iliac vessels
-Formed by the ventral rami of S1-Co with a significant contribution from L4 & L5
What areas/muscles does the sacral & coccygeal plexus innervate?
-Muscles of the lower limb
-Muscles of the pelvis and perineum
-Cutaneous branches supply skin over the medial side of the foot, posterior aspect of lower limb, and most of the perineum
What forms the sacral plexus? Where is it located? Where does it pass through?
-Formed by anterior rami of S1-S4 and the lumbosacral trunk (L4 & L5)
-Located anteriorly to the piriformus muscle which is part of the posterolateral pelvic wall
-Passes out of the anterior sacral foramina & course laterally & inferiorly on the pelvic wall
Which major lower extremity nerves are formed by branches of the sacral plexus?
-Sciatic nerve
-Gluteal nerves
-Pudendal nerve (innervates perineum)
-Nerve to quadratus femoris
-Posterior femoral cutaneous nerves
-Nerve to piriformis
-Nerves to levator ani, coccygeus, and external anal sphincter
Where do most nerves from the sacral plexus exit the pelvic cavity?
Most exit by passing through the greater sciatic foramen, inferior to the piriformis muscle
What does the coccygeal plexus innervate?
Sensory to the perineum
What are the boundaries of the thoracic wall?
-The superior thoracic aperture bordered by vertebrae T1, rib 1, and the manubrium of the sternum
-The inferior thoracic aperture bordered by vertebrae T12, rib 12, the end of rib 11, costal margin, and the xiphoid process of the sternum
What is the skeletal framework of the thoracic wall?
-Thoracic vertebrae
-Intervertebral discs
-Ribs
-Sternum
What are the classifications of the ribs?
-True ribs
-False ribs
-Typical
-Atypical
-Floating ribs