Mid-midbrain.

Question 1

Name this and state its function.

Answer 1

Tectum.

• Sensorimotor integration, state the different roles of the inferior colliculi and the superior colliculi.

Question 2

Name this and its divisions+ function?

Answer 2

Substantia nigra.

• Modulating movement and reward within the basal ganglia circuitry.
• Containing dopaminergic neurons.
  
  • Division:
    
    • Pars compacta: dopaminergic neurons.
    • Pars reticular: GABAnergic neurons.

Question 3

Name this and state its function.

Answer 3

Cerebral aqueduct.

• Allows CSF to flow from 3rd ventricle—–>4th ventricle.

Question 4

Name this and state its function.

Answer 4

Crus cerebri.

• Forms the middle cerebellar peduncle and connects both Cerebral hemispheres with opposite cerebellum.

Question 5

Name this and state its function.

Answer 5

Medial Lemniscus.

• 2nd order neurons, sensory spinothalamic information from medulla—->thalamus—> Primary somatosensory cortex.

Question 6

Name this, what is it and state its function.

Answer 6

Lateral lemniscus.

• Carries auditory information from cochlear nucleus—>brainstem nuclei—> controlateral inferior colliculus.
• Tract of axons found in brainstem.

Question 7

Name this, state its function[2 marks] and how it goes about its function[4 marks].

Answer 7

Medial longitudinal lemniscus.

• Integrates movement of the eye and head movement.

How?

• Connects all nerves of eye movement:
  
  • ​Oculomotor(III), Trochlear(III) and Abducens(VI).
    
    • ​also the Vestibulocochlear nerve(VIII).

Question 8

Name this and state its function.

Answer 8

Oculomotor nucleus.

• Autonomic function of Oculomotor nerve, involved in papillary constriction and lens accommodation.

Question 9

Name this, state its function[3 marks] and cells involved contributing to function.

Answer 9

Periaqueductal grey.

• Autonomic control of behavioral responses to a threatening stimulus.
• Primary center for pain descending modulation:
  
  • via Enkephalin-producing cell: suppress pain.

Question 10

Name this and state its function.

Answer 10

Root fibres of Oculomotor nerves(CN III).

• Function of CNIII*:
• innervates movements of the eye and innervation of eye lid.