anatomy - muscles of axial skeleton and rump

Question 1

what is the origin, insertion, action, and innervation of the middle gluteal muscle

Answer 1

* origin: the crest and gluteal surface of the ilium
* insertion: greater trochanter of femur
* action: extend and abduct hip joint and rotate pelvic limb medially
* innervation: cranial glueal nerve

Question 2

what is the origin, insertion, action, and innervation of the internal obturator

Answer 2

* origin: symphysis pelvis and the dorsal surface of ischium and pubis
* insertion: trochanteric fossa of the femur
* action: rotate pelvic limb laterally at hip joint and prevent medial rotation on weight bearing
* innervation: sciatic nerve

Question 3

what is the origin, insertion, action, and innervation of the gemelli muscle

Answer 3

* origin: lateral surface of the ischium
* insertion: trochanteric fossa
* action: rotate pelvic limb laterally at hip joint and prevent medial rotation on weight bearing
* innervation: sciatic nerve

Question 4

what is the origin, insertion, action, and innervation of the quadratus femoris

Answer 4

* origin: ventral surface of caudal part of ischium
* insertion: interrochanteric crest of femur
* action: extend the hip joint and rotate the pelvic limb laterally
* innervation: sciatic nerve

Question 5

what is the origin, insertion, action, and innervation of the external obturator muscle

Answer 5

* origin: ventral surface of pubis and ischium
* insertion: trochanteric fossa of femur
* action: rotate the pelvic limb laterally at hip joint and prevent medial rotation on weight bearing
* innervation: obturator nerve

Question 6

what is the origin, insertion, action, and innervation of the longus capitus

Answer 6

* origin: transverse process of cervical vertebrae
* insertion: muscular tubercle on the ventral surface of basioccipital bone of skull
* action: ventral and lateral flection of neck
* innervation: ventral branches of cervical nerves

Question 7

what is the origin, insertion, action, and innervation of the longus colli

Answer 7

* origin: entral aspect of transverse processes of T6 – C2
* insertion: ventral aspect of vertebral bodies T5 – C1
* action: ventral flexion (bilateral) of neck
* innervation: ventral branches of cervical nn.

Question 8

what is the origin, insertion, action, and innervation of the transversospinalis system

Answer 8

* origin: vertebrae
* insertion: vertebrae
* action: lifting head and extension of vertebral column, lateral flextion of vertebral column
* innervation: spinal nerves

lies against the arches over the vertebral canal and spinous processes

Question 9

what is the origin, insertion, action, and innervation of the longissimus system

Answer 9

* origin: thoracic vertebrae
* insertion: cervical vertebrae
* action: extend head and neck (lateral flexion)
* innervation: spinal nerves

Question 10

what is the origin, insertion, action, and innervation of the ilicostalis system

Answer 10

* origin: iliac crest
* insertion: transverse process of lumbar vertebrae, ribs, C7
* action: lateral flexion
* innervation: spinal nerves

Question 11

what is the origin, insertion, action, and innervation of the splenius muscle

Answer 11

* origin: first three thoracic vertebral spines
* insertion: nuchal crest and mastoid part of temporal bone (skull)
* action: lateral flexion
* innervation: cervical nerves

Question 12

what is the origin, insertion, action, and innervation of the semispinalis capitus

Answer 12

• origin: cervical and thoracic vertebrae
• insertion: nuchal crest and occipital bone
• action: lateral flexion
• innervation: cervical nerves