Week 7

Question 1

What is segmented nerve supply

Answer 1

One spinal chord segment supplies one area

Question 2

What is intergrated supply segment

Answer 2

A number of spinal chord segments supplies an area for complex coodinate muscle activity

plexus

Question 3

Componants of the Spinal Chord

Answer 3

• Posterior longitudinal ligament
• epidural fat
• dua mata
• arachnoid mata
• subarachnoid space
• pia mata
• spinal chord

Question 4

Arrangment of Nerves through the intervertebral foramen

Answer 4

8 pairs of cervical nerves from the above

12 pairs of thoracic nerves from below

5 pairs of lumbar nerves from below

5 pairs of sacral nerves

1 pair of cocygeal nerves from sacral hiatus

Question 5

fate of the dorsal primary ramus. Which nerves remain segmented?

Answer 5

C1-C8

T1-12

L1-L5

S1-S5

Co1

Question 6

Fate of the Ventral primary ramus: Plexuses

Answer 6

C1-4 = Cervical plexus

C5-11 = brachial plexus

L1-L5 = lumbar plexus

S1-S4 = Sacral plexus

S5-Co = Coccygeal plexus

Question 7

Fate of the ventral primary ramus: Segmented

Answer 7

T1-T11 = intercostal nerves

T12 = Subcostal nerve

Question 8

What are muscles that develop in an Epaxial position supplied by?

Answer 8

Dorsal primary ramus

Question 9

What are the muscles that develop in a hypaxial postition supplied by?

Answer 9

Ventral primary ramus

Question 10

What are the muscle that migrate from a epaxial to hypaxial?

Answer 10

Dorsal primary ramus

e.g. levator costarum

Question 11

What are the muscles that migrate from hypaxial to epaxial?

Answer 11

ventral primary ramus

e.g. levator scap, serratus posterior superior and inferior, latissimus dorsi.

Question 12

What will the upper limbs or the pectorial girdle be supplied by?

Answer 12

brachial plexus (C5-8 + T1)

Question 13

What will the thoracic and abdominal wall be supplied by?

Answer 13

Intercostal nerve (T1-12 + subcostal)

Question 14

What is the lower limbs supplied by?

Answer 14

lumbosacral plexus (l1-5, S1-4)

Question 15

What muscles of the pelvic diaphram are innovated by?

Answer 15

coccygeal plexus

Question 16

Where do the intercostal nerves pass through

Answer 16

Penetrate between innermost and internal intercostals and continue within the costal groove

A collateral branch arises at the costal angle

Question 17

What supplies the anterior and latral skin of the thorax?

Answer 17

Skin is supplied through the anterior and lateral cutaneous branches via the ventral primary ramus

Question 18

What supplies the posterior skin of the thorax?

Answer 18

Dorsal primary ramus (postvertebral)