IV ventricle (ventriculus quartus) is a cavity whose base is the rhomboid fossa. The roof-shaped tent, IV ventricle juts out into the cerebellum.
Rhomboid fossa (fossa rhomboidea) is bounded above by the upper legs of the cerebellum, and the bottom lower. You can only see her after the removal of the cerebellum. The upper corner of the rhomboid fossa communicates with the water supply of the brain, lower and side edges - with the subarachnoid space. The lower corner is also a link between the IV ventricle and central canal of spinal cord.
Rhomboid fossa is divided into upper and lower triangles. The boundary of the brain are the strips that represent auditory fibers and passing between the lateral angles, which are located in the auditory nuclei (VIII pair). In the center of the rhomboid fossa is the median sulcus (sulcus medianus), on both sides of which are the medial eminence (eminentiae mediales). At the back of the front elevation is hump (colliculus facialis). In general, the bottom of the IV stomach is the location of the projection of the nuclei of cranial nerves V to XII pair.
|In Fig. 263.
1 - the roof of the midbrain;
2 - median furrow;
3 - medial eminence;
4 - the upper leg of the cerebellum;
5 - Average leg of the cerebellum;
6 - facial tubercle;
7 - lower leg of the cerebellum;
8 - wedge-shaped tubercle of the medulla oblongata;
9 - thin lobe of the medulla oblongata;
10 - V-shaped bundle of the medulla oblongata;
11 - a thin beam of the medulla oblongata
In the upper triangle in the middle groove, located nucleus of the trigeminal nerve (V pair), abducens nucleus (VI pair) and lie a little deeper nucleus of the facial nerve (VII pair). Rounding the nucleus of abducent nerve processes of the core bodies of the facial nerve form a rhomboid fossa elevation, called the facial tubercle. In the lower triangle are the core preddverno-cochlear nerve (VIII pair), which are called vestibular. In the triangle of the vagus nerve nucleus projected glossopharyngeal (IX pair) and the vagus nerve (X pair). They have a general motor nucleus of cells whose processes form the accessory nerve fibers (XI pair). The core of the hypoglossal nerve (XII pair) is projected in the triangle on the sides of the hypoglossal nerve, posterior median sulcus of the medulla oblongata.
a., aa. — arteria, arteriae (artery, the artery)
lig., ligg. — ligamentum, ligamenta (ligament, the ligaments)
m., mm. — musculus, musculi (muscle, the muscle)
n., nn. — nervus, nervi (nerve, the nerve)
r., rr. — ramus, rami (branch)
s. — seu (or)
v., vv. — vena, venae (vienna)