MCQS WITH DAVE
Neuroanatomy vol 1
,Practice Questions
1. Following statements concerning the thalamus are correct except:
a) It is the largest part of the diencephalons and serves as a relay station to
all the main sensory tracts (except the olfactory pathway)
b) It is separated from the lentiform nucleus by the internal capsule
c) It forms the anterior boundary of the interventricular foramen
d) It may be joined to the thalamus on the opposite side
e) The gray matter of the thalamus is divided by a vertical sheet of white
matter called the internal medullary lamina
Answer: C
Detailed Explanation: The thalamus actually forms the lateral wall of the third
ventricle and the posterior boundary of the interventricular foramen (Foramen of
Monro). The anterior boundary of this foramen is formed by the column of the fornix.
The thalamus is a vital relay station; nearly all sensory information (vision, hearing,
touch) passes through its nuclei before reaching the cerebral cortex, with the notable
exception of olfaction, which reaches the cortex directly.
,2. Which of the following statement is (are) correct concerning the third
cranial nerve nuclei?
a) The oculomotor nucleus is situated in the central gray matter
b) The parasympathetic part of the oculomotor nucleus is called the
Edinger-Westphal nucleus
c) The fibers from the oculomotor nucleus pass through the red nucleus
d) The oculomotor nucleus lies just posterior to the medial longitudinal
fasciculus
e) All of the above
Answer: E
Detailed Explanation: All statements are correct. The oculomotor (CN III) nucleus is
located in the midbrain's periaqueductal gray matter at the level of the superior
colliculus. It contains a somatic motor part for extraocular muscles and the Edinger-
Westphal nucleus for parasympathetic control of the pupil (constriction) and lens
(accommodation). The exiting fibers typically traverse the red nucleus on their way to
the ventral surface of the midbrain.
3. Which of the following statement is incorrect concerning the internal
structure of the midbrain?
a) The tectum is the part posterior to the cerebral aqueduct
b) The crus cerebri on each side lies anterior to the substantia nigra
c) The tegmentum lies posterior to the substantia nigra
d) The central gray matter encircles the red nuclei
Answer: D
Detailed Explanation: The central gray matter (periaqueductal gray) encircles the
cerebral aqueduct, not the red nuclei. The red nuclei are situated within the
tegmentum, anterior to the aqueduct. The midbrain is divided into the tectum (roof),
tegmentum (middle), and crus cerebri (base). The substantia nigra serves as the
landmark separating the tegmentum from the crus cerebri.
, 4. Which of the following does not match between an artery and its
branch?
a) Internal carotid/ posterior communicating
b) Basilar/ posterior inferior cerebellar
c) Vertebral/ anterior spinal
d) Anterior cerebral/ anterior communicating
e) Ophthalmic/ anterior ethmoidal
Answer: B
Detailed Explanation: The Posterior Inferior Cerebellar Artery (PICA) is usually the
largest branch of the vertebral artery. The basilar artery gives off the Anterior
Inferior Cerebellar Artery (AICA) and the Superior Cerebellar Artery (SCA) before
bifurcating into the posterior cerebral arteries. Misidentifying PICA as a basilar branch
is a common error in vascular neuroanatomy.
5. The ________ of the spinal nerve contains both motor and sensory fibers:
a) Anterior ramus
b) Posterior ramus
c) Main trunk
d) All of the above
e) None of the above
Answer: D
Detailed Explanation: Spinal nerves are 'mixed' nerves. While the roots (dorsal and
ventral) are functionally segregated into sensory and motor respectively, they join to
form the main trunk of the spinal nerve at the intervertebral foramen. Once the trunk
is formed, it immediately divides into anterior and posterior rami, both of which
carry a mix of motor, sensory, and autonomic fibers to their respective territories.
Neuroanatomy vol 1
,Practice Questions
1. Following statements concerning the thalamus are correct except:
a) It is the largest part of the diencephalons and serves as a relay station to
all the main sensory tracts (except the olfactory pathway)
b) It is separated from the lentiform nucleus by the internal capsule
c) It forms the anterior boundary of the interventricular foramen
d) It may be joined to the thalamus on the opposite side
e) The gray matter of the thalamus is divided by a vertical sheet of white
matter called the internal medullary lamina
Answer: C
Detailed Explanation: The thalamus actually forms the lateral wall of the third
ventricle and the posterior boundary of the interventricular foramen (Foramen of
Monro). The anterior boundary of this foramen is formed by the column of the fornix.
The thalamus is a vital relay station; nearly all sensory information (vision, hearing,
touch) passes through its nuclei before reaching the cerebral cortex, with the notable
exception of olfaction, which reaches the cortex directly.
,2. Which of the following statement is (are) correct concerning the third
cranial nerve nuclei?
a) The oculomotor nucleus is situated in the central gray matter
b) The parasympathetic part of the oculomotor nucleus is called the
Edinger-Westphal nucleus
c) The fibers from the oculomotor nucleus pass through the red nucleus
d) The oculomotor nucleus lies just posterior to the medial longitudinal
fasciculus
e) All of the above
Answer: E
Detailed Explanation: All statements are correct. The oculomotor (CN III) nucleus is
located in the midbrain's periaqueductal gray matter at the level of the superior
colliculus. It contains a somatic motor part for extraocular muscles and the Edinger-
Westphal nucleus for parasympathetic control of the pupil (constriction) and lens
(accommodation). The exiting fibers typically traverse the red nucleus on their way to
the ventral surface of the midbrain.
3. Which of the following statement is incorrect concerning the internal
structure of the midbrain?
a) The tectum is the part posterior to the cerebral aqueduct
b) The crus cerebri on each side lies anterior to the substantia nigra
c) The tegmentum lies posterior to the substantia nigra
d) The central gray matter encircles the red nuclei
Answer: D
Detailed Explanation: The central gray matter (periaqueductal gray) encircles the
cerebral aqueduct, not the red nuclei. The red nuclei are situated within the
tegmentum, anterior to the aqueduct. The midbrain is divided into the tectum (roof),
tegmentum (middle), and crus cerebri (base). The substantia nigra serves as the
landmark separating the tegmentum from the crus cerebri.
, 4. Which of the following does not match between an artery and its
branch?
a) Internal carotid/ posterior communicating
b) Basilar/ posterior inferior cerebellar
c) Vertebral/ anterior spinal
d) Anterior cerebral/ anterior communicating
e) Ophthalmic/ anterior ethmoidal
Answer: B
Detailed Explanation: The Posterior Inferior Cerebellar Artery (PICA) is usually the
largest branch of the vertebral artery. The basilar artery gives off the Anterior
Inferior Cerebellar Artery (AICA) and the Superior Cerebellar Artery (SCA) before
bifurcating into the posterior cerebral arteries. Misidentifying PICA as a basilar branch
is a common error in vascular neuroanatomy.
5. The ________ of the spinal nerve contains both motor and sensory fibers:
a) Anterior ramus
b) Posterior ramus
c) Main trunk
d) All of the above
e) None of the above
Answer: D
Detailed Explanation: Spinal nerves are 'mixed' nerves. While the roots (dorsal and
ventral) are functionally segregated into sensory and motor respectively, they join to
form the main trunk of the spinal nerve at the intervertebral foramen. Once the trunk
is formed, it immediately divides into anterior and posterior rami, both of which
carry a mix of motor, sensory, and autonomic fibers to their respective territories.
