Week 3 Flashcards
what do extrinsic back muscles do
control limb and respiratory movements
name the two major groups of muscles in the back
the extrinsic and intrinsic
what do the intrinsic (deep) muscles do
act on the vertebral column, producing its movements and maintaining posture
both serratus muscles are innervated by _________ nerves running within the ribcage
intrinsic back muscles are innervated by
posterior rami of spinal nerves
intrinsic back muscles act to
maintain posture and control movements of the vertebral column
The _______ muscles cover and hold the deep neck muscles in position.
splenius
what is the common origin of the three erector spinae
a broad tendon that attaches inferiorly to the posterior part of the lilac crest, the posterior aspect of the sacrum, the sacro-iliac ligaments, and the sacral and inferior lumbar spinous processes.
the primary action of semispinalis
extension of the head, cervical spine and thoracic spine
contralateral rotation
where is the multifidus thickest?
in the lumbar region
what is the action of the multifidus?
stabilization of the vertebral column
where is the rotatores best developed?
in the thoracic region
what is the primary action of the rotatores?
stabilization of the vertebral column; proprioception of the vertebral column and may assist in small oratory movements in the thoracic spine
segmental muscles of the back are relatively sparse in which region?
the thoracic region
suboccipital muscles are innervated by
the posterior ramus of C1, the suboccipital nerve
innervation of Sternocleidomastoid (SCM).
cranial nerve 11 - spinal accessory nerve
innervation of platysma
cranial nerve 7 - facial nerve
what are the three main foramina in the diaphragm?
Aortic hiatus or opening (TXII level), esophageal hiatus or opening (TX Level) and caval opening (TVIII level)
what is the nerve supply of the diaphragm?
R. & L. phrenic nerves (C3,4,5)
action of the diaphragm
depress dome (moves inferiorly) therefore increasing the volume of the thoracic cavity
- volume increases and pressure decreases, therefore it is the major muscle of inspiration
diaphragm attachments
xiphoid process, costal margin, end of ribs 11 and 12, lumbar vertebra (LI - LIII).
- Muscle fibers converge from the peripheral attachments of the muscle to join to the central tendon.
which muscles make up the superficial layer of extrinsic back muscles
trapezius, latissimus dorsi, levator scapulae, and rhomboids
How are the extrinsic back muscles innervated?
their nerve supply from the anterior rami of cervical nerves and act on the upper limb.
how is the trapezius intervated?
motor fibers from a cranial nerve, the spinal accessory nerve (CN XI). (11)