Question

1. Which of the following sets of nerves all serve dorsal (extensor) structures?

   		Peroneal, Femoral, Axillary
   		Axillary, Radial, Obturator
   		Peroneal, Radial, Gluteal
   		Musculotaneous, Median, Ulnar
   		Obturator, Median, Musculocutaneous

2. Shortly after an axon is depolarized, it can't function for a brief period of time. This period of time is referred to as:

   		the refractory phase.
   		the action potential.
   		depolarization.
   		the inhibitory phase.
   		lunchtime.

3. The muscles from the neck that are equivalent to the external oblique, internal oblique, and transverses abdominus together are?

   		Scalenes and diaphragm
   		External intercostals, internal intercostal, and transveralis fascia
   		Iliocostalis, longissimus dorsi, and transversospinalis
   		Rectus abdominus, sternum, pubis
   		Transversus abdominus, transversus thoracis, transversalis fascia

4. The rectus capitus posterior major runs from:

   		the spinous process of C1 to the occipital bone (base of the skull)
   		the spinous process of C2 to the occipital bone (base of the skull)
   		the spinous process of C2 to the transverse process of C1
   		the spinous process of C1 to the transverse process of C2
   		from the transverse process of C1 to the occipital bone (base of the skull)

Answer 1

1) peroneal, radial ,gluteal.

Peroneal nerve supplies the muscles of the anterior compartment of leg which are extensors. Radial nerve innervates the muscle of posterior compartment of upper limb. Gluteal nerve(superior) innervates Gluteus maximus which is an extensor.

2) refractory phase.

It is the phase during which the excitable membrane recovers itself for another stimulus.

3) external intercostals, internal intercostals and transversalis fascia.

The direction of fibres of muscles is same. The fibres of both external oblique and external inetrcostals move inferiorly and medially. The fibres of both internal oblique and internal intercostals move superiorly and medially.

4) spinous process of C2 to occipital bone.