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HPHS222W2_Neurohistology Questions
Question 1
1.1 Name the tissue in Figure 1 (1)
It’s a cross section of the spinal cord.
1.2 Name two components that are found on the tissue (Figure 2) and comment on the differences
in location and function of these components (3marks
Spinal cord is made up of Grey matter and white matter.
Grey matter if located at the centre of the spinal cord and it has a butterfly shape whereas
the White matter is found on the outside of the spinal cord.
Their functions:
Grey matter is the area where many types of neurons synapse and then it distributes information
to other parts of the spinal cord and brain whereas White Matter conduct, process nerve signals
and allows communication between different parts of the spinal cord and the brain.
1.3 Give two factors that are required for repair of axons and dendrites? (2)
Intrinsic and extrinsic factors
Figure 1
Question 2 (6 marks)
1.Describe the structural make up of a dendrite (4 marks).
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Dendrites are typically short, highly branched and unmyelinated. They contain
neurofibrils and Nissl bodies. Their surfaces are specialized for contact with are
neurons. Dendrites form tree like projections that become stimulated by other neurons
and conduct the electrochemical charge to the cell body.
2.At what stage does myelination in PNS happen and what cells mainly initiate this process (2
marks)
Myelination happens during fetal development. Schwann cells make myelin in the
peripheral nervous system.
Question 4 (6 marks)
1.Describe the appearance of efferent ductules and the structural characteristics that aids the
function of efferent ductules. (4 marks)
The appearance of efferent ductules is of a “saw tooth pattern” of tall cells alternating
with short cells. A thin band of smooth muscle surrounds each ductule.
These ductules are a series of parallel thin, delicate tubules that connect the rete testis
to a single tube (the epididymis), this make the efferent ductules structural suitable to
collect, store and conduct spermatozoa from the rete testis into the head of the
epididymis.
2.Name two cells that are found on the epithelium of the epididymis. (2 marks)
The epididymis is lined with Pseudostratified columnar epithelial cells which is
composed of principal cells and basal cells.

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