Nerve supply of the body wall (dave's notes) Flashcards
How is the body wall supplied?
Segmentally bu spinal nerves
What do the posterior rami supply?
Posterior rami pass backwards and supply the extensor muscles of the vertebral column and skull
How far forward does the cutaneous innervation of the posterior rami extend?
To the posterior axillary lines
How do posterior rami divide? What do the divisions supply?
Each posterior ramus divides into a medial and a lateral branch. Both supply muscle, only one supplies skin. Upper medial, lower lateral
What is notable about C1? What other spinal nerves share this trait?
No cutaneous branch. Nor do the lower two cervical nerves or ??Ln?
What is notable about limb skin and muscle?
It is not supplied by posterior rami
What do anterior rami supply?
All the other muscles of the trunk not supplied by the posterior rami,
limbs,
skin at the front and sides of the body
T1-T12 and L1 supply the body wall segmentally. What do the lower six intercostal nerves supply???? What about below L1?
Muscles of the anterior abdominal wall??
The muscles below L1 has migrated into the thigh
What levels supply the neck?
C2,3,4
What levels supply the upper limb?
C5,6,7,8,
T1
Nerves of the body wall spiral in a plane between………
the middle and deepest if the three muscle layers
Where are the spinal nerves located relative to the arteries? Where do they cross the arteries?
Nerves lie below the artery, and ckorss the arteries posteriorly alongside the vertebral column and again anteriorly near the ventral midline
What lies nearer to the skin - artery or nerve?
The nerve always lies nearer to the skin
What runs within the arterial circle?
The sympathetic trunk runs vertically within the arterial circle (does not run in the neurovascular plane) - runs anterior to the segmental vessels
What does every spinal nerve carry? Where do they leave the spinal nerve?
Every spinal nerve carries postganglionic sympathetic fibres (unmyelinated grey), which leave the spinal nerve at the peripheral destination
