Posted by Big D :P on September 26, 2009 at 13:42:18:
In Reply to: Re: Back: True/False Part I [Dr. Evey help needed #15] posted by Nick Ahn on September 26, 2009 at 10:19:32:
Gray's says that the filum internus whatever is an extension of pia mater.
I'm also with you on #21 there Nick.
: Kevin is awesome.
: Just a few minor points.
: a) I skipped #s 1-11 (at this point) because they were related to subjects in the suboccipital region/spinal canal lecture. only questions 12-21 are related to the back musculature lecture
: b) in terms of questions 12-21
: : 15. Paralysis of the rhomboids (dorsal scapular nerve) and the trapezius (spinal accessory nerve) is expected cause uncompenstated loss of retraction of the scapula.
: : FALSE
: I thought this was true, but I could be wrong. My question is, what other muscles retract scapula?
: Googling tells me that lat dorsi also retracts scapula but it is a muscle that is generally not celebrated for the retraction of scapula. this undercelebration makes sense because lat dorsi does not attach to the scapula at all. some sources say that it may have its origin in part from the inferior angle of the scapula, but I'm not sure if that would contribute its motion to the retraction of it.
: Afterall my question still is, what other muscles retract scapula?
: Also, since the TAs and Dr. Evey have been emphasizing that we should know what motions are limited if a certain muscle or a nerve is injured. Does anyone know of a good source that lists the motions and every muscles that contribute to those motions?
:
: : 19. The thoracolumbar fascia provides a site of origin for the rhomboids and the levator scapula.
: : FALSE � provides origin for latissimus dorsi
: I agree. The thoracolumbar fascia also provides a site of origin for the serratur posterior inferior.
:
: : 21. Iliocostalis attaches to the ribs along the costotransverse joints.
: : TRUE � Gray�s says that iliocostalis inserts onto the ribs at their angles; not sure if this is equivalent to the costotransverse joints
: I'm going to say false. The costovertebral joints are where ribs articulate with the transverse processes of the thoracic vertebrae. The angels of the ribs are quite lateral to the heads of the ribs (which articulates with the vertebrae).