Most of them are located between the bilateral thalamus and form a narrow gap. The anterior superior part is connected with the lateral ventricle through the interventricular foramen, and the posterior inferior part is connected with the midbrain aqueduct.The sagittal plane is similar to a quadrangle, 2.5~3cm high, and slightly longer in front and back diameters.
Slightly above the center of the third ventricle, there is a gray matter block connecting the left and right thalamus, called the middle syndesm or middle block.There are two recesses at the lower front of the third ventricle, and a slightly higher recess extends above the optic chiasma, which is called the optic recess;There is a recess at the lower part, which extends into the pituitary pedicle and is shaped like a funnel.The lower part of the front wall is the end plate, and the upper part is the front commissure and vault.Interventricular foramen lie between the fornix and the thalamus.At the top is a middle sail composed of a layer of epithelium, with choroidal plexus extending into it.The pineal gland, posterior commissure and mesencephalic aqueduct are posterior.The bottom of the third ventricle from front to back is the optic chiasma, funnel, gray nodule, papillary body, posterior perforator substance, cerebral foot and middle tegmentum.The lateral wall is the inner surface of the optic and inferior colliculus.
Anatomical characteristics
Announce
edit
The narrow sagittal fissure between the two diencephalons is connected with the left and right ventricles through the interventricular foramen in the front and backwardmidbrainThe water tube is connected with the fourth ventricle.The third ventricle is divided into the top, bottom, front, back and both sides.
Top: It is composed of the ventricular membrane between the thalamic zone and the pia mater covering it.This pia mater is called the choroid tissue of the third ventricle, in which two choroid plexus protrude into the third ventricle.The choroid plexus of the third ventricle moves forward to the interventricular foramen and moves to the choroid plexus of the left and right ventricles.
Bottom: obliquely forward and downward, mainly composed of hypothalamus.The chamber extends downward into the funnel, forming a funnel recess.
Front wall: the lower part is composed of the end plate, and the upper part is composed of the dome column and the front commissure.At the rear of the junction between the front wall and the top wall, there is an inter compartment hole.
Posterior wall: composed of pineal gland and posterior commissure.
Lateral wall: the upper part is composed of 2/3 of the front of the medial side of the thalamus, and the lower part is composed of the hypothalamus. There is an intermediate block between the two walls.
When the working mirror enters the lateral ventricle through the anterior horn approach of the lateral ventricle, the first thing to see is the interventricular foramen and the choroid plexus running from the posterior to the interventricular foramen.The endoscopic field of vision is pushed into the third ventricle through the interventricular foramen. In the third ventricle, the front edge of the intermediate block directly in front of the field of vision and the choroid plexus structure and anterior commissure at the top of the third ventricle that continue with the choroid plexus of the lateral ventricle can be seen first.The endoscopic field of vision is advanced through the anterior syndesmosis and the middle block gap, and the end plate structure, optic chiasma recess and funnel recess can be seen through the combination of 120 ° endoscope.Push the endoscope view through the space above the middle piece, and you can see the rear of the middle sail backward. Push the endoscope view further through the space above and below the middle piece, and you can see the pineal recess, posterior commissure, and upper mouth of the aqueduct.
