Diencephalon

A description of the Diencephalon - a certain region of the brain

1. www.Examville.com
Online practice tests, live classes, tutoring, study guides
Q&A, premium content and more.

2. DIENCEPHALON

3. CEREBRUM
Largest part of the
brain
Situated in the
anterior and middle
cranial fossa
Divided into two
parts:
1.Telencephalon
2.Diencephalon

4. DiencephalonDiencephalon
Sits on top of the brain stem
Enclosed by the cerebral
hemispheres
Made of four parts:
Thalamus
Hypothalamus
Epithalamus
Subthalamus

5. DiencephalonDiencephalon
Consists of the 3
rd

ventricle and the
structures that form its
boundaries, most
rostral part of the
brainstem.
Ant.: Intervent. fora.
Post.: where the 3
rd

vent. Forms the
cerebral aqueduct.

6. CHARACTERISTICS OF THE
MIDBRAIN-DIENCEPHALIC JUNCTION
Addition of several masses of neurons
surrounding the rostral part of the post. and
lat. Mesencephalon.
Medial and lateral geniculate body fiber.
Cerebral aqueduct expands into 3
rd
vent.
Sup. Colliculi replaced by pre-tectal region
Fasc. Retroflexor – vertical fibers traversing
the medial portion of the red nucleus.

7. Inferior surface of the Diencephalon
Only exposed area to
the surface in the
intact brain.
Hypothalamus and
other structures:
Optic chiasma
Infundibulum with the
tuber cinerium
Mamillary body

8. Superior surface of the Diencephalon
Concealed by the
fornix : thick bundle of
nerve fibers from the
hippocampus of temp.
lobe and arches
posteriorly over the
thalamus to join the
mamillary body
Roof of 3
rd
vent.

9. Lateral surface of the Dierncephalon
Bounded by the
internal capsule

10. Medial surface of the Diencephalon
Superior part by the
medial surface of the
thalamus
Inferior part by the
hypothalamus
These 2 areas are
separated by a
shallow sulcus the
Hypothalamic sulcus.

11. Diencephalon

12. Diencephalon

13. Diencephalon

14. Diencephalon: Thalamus
“Gateway to cerebral cortex”
Most sensory stimuli project
to the thalamus, which in turn
projects to the cerebrum.
Thalamus also influences
moods and activities
associated with strong
emotion.
(Two concepts: Sensory
integration and Mood)

15. Diencephalon:Thalamus
Large ovoid mass of
gray matter forming a
greater part of the
Diencephalon.
Cell station to all main
sensory system
except the olfactory
pathway.

16. Diencephalon

17. HYPOTHALAMUS

18. HYPOTHALAMUS

37. It’s FREE to join.
http://www.examville.com