Lec. 2: Innervation and Action of Deep mms of the Back Flashcards
(14 cards)
serratus POST SUP (intermediate mm)
n: ventral rami T1-T4 (intercostal nerves)
act.: elev. 2-5 ribs during forced inspiration
serratus POST INF (intermediate mm)
n: ventral rami T9-T12 (intercostal nerves)
act.: stabilizes lower ribs during forced expiration, rotation to the same side and extension of thoracic spine
levator costorum (intermediate mm)
n: dorsal rami of C8-T11
act.: elevate ribs (assist w/ inspiration) and assist w/ LAT FLEX of spine
splenius cervicis
n: dorsal rami of spinal nerves
act.: EXT, LAT FLEX, and ROT to the same side of the C/SP
splenius capitis
n: dorsal rami of spinal nerves
act.: EXT, LAT FLEX, and ROT to the same side of the head and C/SP
iliocostalis lumborum
n: dorsal rami of spinal nerves
act.: EXT, LAT FLEX and ROT to the same side of the spine
all deep mms of the back are innervated by the dorsal rami of spinal nerves besides which one
intertransversarii
which 3 deep mms of the back act to EXT, LAT FLEX and ROT (or assist w/ ROT) to the same side of the spine
-iliocostalis lumborum
-iliocostalis thoracis
-longissimus thoracis
which 5 deep mms of the back act to EXT, LAT FLEX and ROT (or assist in rotation) to the same side of the C/SP
-splenius cervicis
-splenius capitis
-iliocostalis cervicis
-longissimus cervicis
-longissimus capitis
which 3 mms act to EXT and LAT FLEX the spine
-spinalis thoracis
-spinalis cervicis
-intertransversarii
which 3 mms act to ROT to the opposite side, EXT, and LAT FLEX spine
-multifidi
-semispinalis thoracis
-semispinalis cervicis (only in C/SP)
which mm(s) acts to ROT to the opposite side and EXT the spine
rotatores brevis and longus
which 4 mms act to EXT and LAT FLEX the head and or C/SP
-spinalis thoracis (whole spine)
-spinalis cervicis (whole spine)
-semispinalis capitis (head and C/SP)
-intertransversarii (whole spine)
deep mm of the back that only acts to EXT the spine (no other actions)
interspinales
