Spine & Thorax Flashcards
Name the prevertebral muscles located on the anterior neck
longus colli, longus capitis, rectus capitus anterior, rectus capitus lateralis
Which prevertebral muscle side bends the head?
rectus capitus lateralis
What actions does the SCM perform?
bilaterally- flexes the neck, hyperextends the head
unilaterally- SB the neck to the opposite side
Where does the SCM originate and insert?
clavical to mastoid process
Name the actions the scalene perform?
bilaterally- assist in cervical flexion
unilaterally- SB the cervical spine
Name the Origin & insertion of all the scalene muscles
Anterior- TP of C3-C6 to 1st rib
Middle- TP of C2-C7 to 1st rib
Posterior- TP of C5-C7 to 2nd rib
Name the sub occipital muscles (4)
obliques captifs superior, obliquus captifs inferior, rectus capitus posterior minor, rectus capitus posterior major
What action do the occipital muscles perform & how?
Extend the head by pivoting the skull & atlas around the odontoid process
Origin & insertion of the splenius capitis
Spinous process of C7-T3 to mastoid
Origin & insertion of the splenius cervicis
Spinous process of T3 to T6
What actions does the splenius cervicis perform?
bilaterally- extend the neck
unilaterally- rotate and SB neck to the same side
Origin & insertion of rectus abdominis
crest of the pubis to Xiphoid process & costal cartilages of 5,6,7 ribs
Rectus abdominis action?
Strong trunk flexor, compresses abdominals
What separates the 2 sides of the rectus abdominis?
linea alba
Action of the external oblique
unilateral- SB to the same side, rotates the trunk to the opposite side
Bilaterally- flex the trunk
External oblique origin & insertion
lateral lower 8 ribs inserts at the iliac crest & linea alba
Which trunk muscle forms a “V” shape?
external oblique
Action of the internal oblique
Unilateral- SB same side, rotation to same side
Bilaterally- flexes the trunk
Origin & insertion of internal oblique
originates inguinal ligament & illiac crest to 10-12 ribs
What trunk muscle make an opposite “V” shape?
internal oblique
Which trunk muscle is the deepest?
transverse abdominis
What is the origin & insertion of the transverse abdominis?
inguinal ligament, illiac crest, thorocolumbar fascia to 10-12 ribs, abdominal aponuerosis & linea alba
Actions of the transverse abdominis?
Bilateral- flexes the trunk & compresses the abdomen area
Unilateral- lateral SB to the same side
When the trunk moves on the hips it is considered what kind of muscle action?
reversal muscle action
When are the hip flexors “disabled” and cannot work in reversal muscle action?
When doing a sit up if the pt’s legs are not stabilized and the hips are shortened (hips & knees flexed)
When do the external and internal obliques work as antagonists?
when the spine is being rotated in the same direction. ex: trunk rotation to the L side. internal rotates L side while external rotates right side
Describe line of pull & action of most muscles that attach & insert on spinous process & muscles that attach, insert TVP, rib to rib
spinous process- vertical line of pull (extend)
TVP- vertical line of pull (extend & unilaterally SB)
rib to rib- side bend
The shorter the muscle the better at _______& the longer the muscle the better at ______.
shorter- rotation
longer- extension
muscle actions & line of pull: spinous process to TVP or vise versa?
bilateral- extend the trunk
unilaterally- rotates the trunk
oblique line of pull
