lab 5- spine

Question 1

Answer 1

scalnes
origin: cervicle vertebrae c2-c7
insertion: first and second ribs
action: neck flexion, elevates ribs
innervation: anterior rami of spinal nerves C4-C6

Question 2

Answer 2

Sternocleidomastoid
origin: mandrium and medial portion of the clavicle
insertion: Mastoid process of the
temporal bone, superior nuchal line.
action: (Unilaterally) contralateral
cervical rotation, ipsilateral flexion of the
cervical spine
*(Bilaterally): cervical flexion, assist with
forced exhalation by elevating the sternum
innervation: Accessory nerve (CN XI)

Question 3

Answer 3

Illiocostalis
action:
Bilateral contraction: Extension of spine
Unilateral contraction: Lateral flexion of spine (ipsilateral)

Question 4

Answer 4

Longissimus
Entire muscle:
Bilateral contraction - Extension of spine
Unilateral contraction - Lateral flexion of spine (ipsilateral)
Longissimus capitis only:
Bilateral contraction - Extension of head and neck
Unilateral contraction - Lateral flexion and rotation of head (ipsilateral)

Question 5

Answer 5

Spinalis
action:
Bilateral contraction: extension of head, cervical and thoracic spines
Unilateral contraction: ipsilateral lateral flexion of cervical and thoracic spine

Question 6

Answer 6

rotators
Bilateral contraction: Extension of thoracic spine
Unilateral contraction: Rotation of thoracic spine (contralateral)

Question 7

Answer 7

quadratus labroum
Origin: Iliac crest and Illiolumbar
ligament
Insertion: base of 12th rib and
transverse processes of the lumbar
vertebrae
Innervation: Ventral rami of T12-L4
Actions: (Unilaterally) lateral flexion
of the vertebral column
(Bilaterally): depression of the rib
cage

Question 8

Answer 8

Rectus Abdominis
Origin: pubic crest
Insertion: Xiphoid process, costal cartilages of ribs 5-7
Innervation: Intercostal nerves (T7-T11), subcostal nerve (T12
Function: flexion of the lumbar spine

Question 9

Answer 9

External Oblique
Origin: Ribs 5-12
Insertion: Illiac crest, pubic
tubercle, Linea alba
Innervation: Thoracoabdominal
nerves (T7-11) and subcostal nerve
(T12)
Actions: Contralateral rotation of
torso

Question 10

Answer 10

Internal Oblique
Origin: Inguinal ligament, iliac crest
and the lumbodorsal fascia
Insertion: linea alba, and ribs 10-12
Innervation: Thoracoabdominal nn.
(T7-T11), Subcostal n. (T12),
Iliohypogastric n. (L1) and Ilioinguinal
n. (L1)
Actions: (Unilaterally) ipsilateral
trunk rotation
(Bilaterally): compresses abdomen