51. The anterior cerebral artery:
a. meets in the midline with its opposite fellow
b. ascends in the longitudinal fissure and bends backwards over the
corpus callosum
c. gives off the recurrent artery of Heubner proximal to the anterior
communicating artery
d. gives off the recurrent srtery of Heubner, that supplies the head
of
caudate,putamen, anterior limb, genu and posterior
limb of the
corpus callosum
e. has branches that arch over on to the lateral surface of the
hemispheres to supply a narrow strip of cortex.
52. The vertebral arteries:
a. ascend through foramina in the transverse processes of the
upper
6 cervical vertebrae
b. enter the skull via the foramen of Luschka
c. give off anterior and posterior spinal arteries that supply the
medulla and spinal cord
d. give off the Posterior inferior cerebellar arteries
e. join at the cerebellopontine angle to form the basilar artery
53. The posterior cerebral artery:
a. arises from the trifurcation of the basilar artery
b. curves around the midbrain to reach the medial surface of the
cerebral hemispheres
c. gives off the temporal artery to the superior surface of the
temporal lobe
d. gives off the calcarine artery that supplies all of the primary and
part of the association visual cortex
e. supplies the posterior choroidal artery that supplies the choroid
plexus of the central lateral ventricle
54. The dura mater:
a. is the outermost, toughest meningeal covering
b. is separated from the periosteum of the skull vault by an epidural
space
c. is made up of collagen and elastic fibres in its outer layer
d. is made up of columnar epithelium with interdigitating processes
in
its inner layer
e. forms the falx cerebri, tentorium cerebri and falx cerebelli
f. is supplied by the trigeminal, vagus and upper cervical nerves
55. With respect to the pia and arachnoid mater:
a. develop from the same embryological tissue
b. the pia is intimately associated with the glial limiting membrane
of
the central nervous system
c. they both have tight junctions between the cells of their epithelium
d. the subarachnoid space is a potential space
e. arachnoid is avascular
f. pia is avascular