PAS 407 Muscles of the Back (Exam 1) Questions With
Complete Solutions
action of erector spinae Correct Answers -bilaterally: extend
vertebral column and head, maintain upright posture
unilaterally - laterally bend vertebral column (lateral flexion of
trunk)
action of inferior oblique Correct Answers rotation of C1 (atlas)
on C2 (axis)
action of latissimus dorsi Correct Answers - extends, adducts,
and medially rotates humerus
- raises body toward arms during climbing
*acts on shoulder joint
action of levator scapulae Correct Answers elevates scapula,
tilts glenoid cavity inferiorly by rotating scapula
action of rectus capitis posterior major Correct Answers
Extension of skull (occiput on C1)
action of rectus capitis posterior minor Correct Answers
extension of skull (occiput on C1)
action of rhomboids Correct Answers retract and rotate scapula;
fix scapula to thoracic wall
NOTE:
, fixator = a muscle that stabilizes or fixes a part of the body to
which a muscle in the process of moving another part is
attached.
action of serratus posterior superior Correct Answers
proprioception, elevates upper ribs
action of splenius Correct Answers bilateral contraction: extend
head and neck
unilateral contraction: ipsilateral flexion, rotation of neck
action of superior oblique Correct Answers extension of
skull ?? (UNCLEAR)
action of superior posterior inferior Correct Answers
proprioception, depresses lower ribs
action of transversospinalis Correct Answers - bilateral:
head/vertebral extension
- unilateral: contralateral rotation (upper trunk to opp side)
- important role in proprioceptive feedback
action of trapezius Correct Answers elevates, retracts, depresses
and rotates scapula
acute strain (low back strain) Correct Answers muscle strains
and sprains are the most common causes of low back pain. ...
When the lumbar spine is strained or sprained, the soft tissues
become inflamed. This inflammation causes pain and may cause
muscle spasms
Complete Solutions
action of erector spinae Correct Answers -bilaterally: extend
vertebral column and head, maintain upright posture
unilaterally - laterally bend vertebral column (lateral flexion of
trunk)
action of inferior oblique Correct Answers rotation of C1 (atlas)
on C2 (axis)
action of latissimus dorsi Correct Answers - extends, adducts,
and medially rotates humerus
- raises body toward arms during climbing
*acts on shoulder joint
action of levator scapulae Correct Answers elevates scapula,
tilts glenoid cavity inferiorly by rotating scapula
action of rectus capitis posterior major Correct Answers
Extension of skull (occiput on C1)
action of rectus capitis posterior minor Correct Answers
extension of skull (occiput on C1)
action of rhomboids Correct Answers retract and rotate scapula;
fix scapula to thoracic wall
NOTE:
, fixator = a muscle that stabilizes or fixes a part of the body to
which a muscle in the process of moving another part is
attached.
action of serratus posterior superior Correct Answers
proprioception, elevates upper ribs
action of splenius Correct Answers bilateral contraction: extend
head and neck
unilateral contraction: ipsilateral flexion, rotation of neck
action of superior oblique Correct Answers extension of
skull ?? (UNCLEAR)
action of superior posterior inferior Correct Answers
proprioception, depresses lower ribs
action of transversospinalis Correct Answers - bilateral:
head/vertebral extension
- unilateral: contralateral rotation (upper trunk to opp side)
- important role in proprioceptive feedback
action of trapezius Correct Answers elevates, retracts, depresses
and rotates scapula
acute strain (low back strain) Correct Answers muscle strains
and sprains are the most common causes of low back pain. ...
When the lumbar spine is strained or sprained, the soft tissues
become inflamed. This inflammation causes pain and may cause
muscle spasms
