MSK Lab practical 1 Flashcards
Trapezius
origin: sup nuchal lig along spinous process to tv12
Insertion:lateral superior border of the clavicle/acromium and spine of scapula
Action: superior fibers elevates scapula/ assists in upward rotation of the glenoid cavity
middle fibers-retraction of the scapula
inferior fibers-upward rotation of the glenoid cavity
innervation: carnial nerve 11 motor/ ventral rami of spinal nerves c3,c4 sensory
Latissimus dorsi
origin: spinous process of t6-t12 to all lumbar and sacral and posterior 1/3 of the crest of the ilium/outer surface of ribs 9-12 inferior angle of the scapula
Insertion :floor of the intertubercle groove of the humerus
Action: adducts, extends, medially rotates humerus
innervation: thoracodorsal nerve
Levator scapulae
origin: transverse process of cv1-4
Insertion: medial border of the scapula from superior angle to root of spine
Action: elevates the scapula and assists in downward rotation of glenoid cavity
innervation: c3,c4, drosal scapular never=c5
rhomboideus major
origin: spinous process t2-t5
Insertion: medial border of the scapula from the root of spine to the inferior angle
Action: retracts scapula elevates and downwardly rotates the glenoid cavity
innervation: dorsal scapular nerve
rhomboideus minor
origin: spinous process of c7 and t1
Insertion: medial border of the scapulae from sup angle to root of spine
Action: retracts scapula, elevates and downwardly rotates glenoid cavity
innervation: dorsal scapular nerve
triangle of auscultation
superficial to the sixth intercostal space
lumbar triangle
area of weakness where fat around the kidney may herniate
transverse cervical artery
superficial branch-descends with spinal accessory nerve deep surface of the trapezius
deep branch- deep to the levator scapulae
serratus posterior superior
origin: nuchal ligament and spinous processes of cv7-tv3
Insertion: posterior surface of ribs 2-5
Action: elevates the ribs during inspiration
innervation: intercostal nerves t1-t4
serratus posterior inferior
origin: spinous process of tv11-lv2
Insertion: posterior surface of ribs 9-12
Action: depresses lower 4 ribs during inspiration allowing the diaphram to acts
innervation: intercostal nerve t9-t11 and subcostal nerve
splenius capitus and cervicis
Origin: CV7-tv6
insertion: capitis =lateral portion of the superior nuchal line and mastoid process cervicis portion=posterior tubercles of transverse process
Action: capitas portion extends and rotates head and sidebends head/ cervicis portion: extends rotates neck to same side and binds deeper musculature
innervation: Dorsal rami of c2-c5
erector spinae Iliocostalis- lumborum-thoracis-cervicis
origin: crest of the ilium and sacrum posterior surface of ribs
Insertion: angle of ribs/transverse processes of lower cervical vertebrae
Action: extends vertebral column, lateral flexion to the same side,
innervation: dorsal rami of spinal nerves from the vertebral segmants covered by muscle
erector spinae longissimus-thoracis cervicis capitus
origin: transverse process below
Insertion: transverse process above
Action: extends vertebral column laterally flexion to the same side/ capitas portion extends skull and rotates to the same side
innervation: dorsal rami of spinal nerve from the vertebral segments covered by muscle
erector spinae spinalis
origin: spinous process below
Insertion: spinous process above
Action: extend vertebral column, lateral flexion to the same side, capitas portion extends skull
innervation: dorsal rami of spinal nerves from the vertebral segments covered by muscle
semispinalis thoracis/ cervicis/ capitis
origin: transverse process below
Insertion: transverse process above /cervicis ends at cv2
action: extends one half of vertebral column from lower thoracis to upper cervical, each subdivision spanning four to six vertebrae/ rotates vertebrae above to opposite side
innervation: dorsal rami of spinal nerve from the vertebral segments covered by muscle
multifidus
Action: extension of vertebral column extends from sacrum to cv2
innervation: dorsal primary rami of spinal nerves C1-L5
rotatores
origin: spans one or two vertebrae
Insertion:
Action: extends the vertebral column/ stabalizers
innervation: dorsal primary rami of spinal nerves C1-L5
levator costarum
Action elevate the ribs
innervated by corresponding dorsal rami of spinal nerves c8-t11
rectus capitis posterior major
origin: spinous process of cv2
insertion: inferior nuchal line and occipital bone betweeen inferior nuclal line and foramen magnum
action: extension and lateral flexion of skull to same side
Innervation: suboccitpital nerve
rectus captitis posterior minor
Origin: posterior tubercle of atlas
Insertion: medial portion of inferior nuchal line and occipital bone between inferior nuchal line and foramen magnum
Action: extension and some lateral flexion of the skull
Innervation: suboccitpital nerve
obliquus capitis inferior
O: spinous process of cv2
I: transverse process of atlas
A: rotates the skull and atlas on ondontoid process to the same side
Innervation: suboccipital nerve
obliquus capitis superior
O: transverse process of the atlas
I: occipital bone between superior and inferior nuchal lines
A: extends and side bend the skull to same side
innervation: suboccipital nerve
Pia mater
forms filum terminale/ anchors conus medularis to the coccyx
