“Neocerebellum”-It mediates fine motor coordination.
Joins the cerebellar hemispheres; site of termination of the spinocerebellar tracts.
Divides the cerebellum into anterior and posterior parts.
It divides the cerebellum into superior and inferior parts.
Superior Medullary Velum
White matter lamina that acts as the roof of the IV Ventricle.
Superior Cerebellar Peduncles (SCP)
“Brachium Conjunctivum”- carry bundle of fibers from midbrain and pons to the cerebellum.
Middle Cerebellar Peduncles (MCP)
“Brachium Pontis”- carry fibers mostly from pons to the cerebellum.
Inferior Cerebellar Peduncles (ICP)
“Restiform Body”- carry fibers from the medulla and spinal cord to the cerebellum.
Receive input from the cerebellar cortex and they represent the output of the cerebellum.
Arrangement of cerebellar gray and white matter.
Located in the tectum of the midbrain; formed by 4 colliculi. The Superior Colliculus receives visual input and is involved in ocular motor control. The Inferior Colliculus receives auditory input from the brain stem and auditory cortex.
The brachia connects the colliculi with the thalamus.
purely motor; supplies the Superior Oblique muscle.
Located anterior to cerebral peduncles; contains motor tracts.
Space between the cerebral peduncles; C.N. III emerges from it.
Motor fibers supply Levator Palpebrae Superiori, Inferior Rectus, Medial Rectus, Superior Rectus, and Inferior Oblique. It also has parasympathetic fibers that control pupillary constriction and lens accommodation.
Contain multiple nuclei that regulate sensory and motor innervation to the face; involved in breathing, swallowing, auditory input, balance, sleep/consciousness.
Mixed nerve; sensory fibers supply the face, motor fibers supply muscles of mastication.
Dorsal Median Sulcus
Posterior groove in closed medulla.
Elevation in the Rhomboid fossa.
Dorsal elevation formed by the facial nerve looping around the abducens nerve inside the pons.
Dorsal elevation formed by the presence of the vestibular nuclei inside the pons.
Portion of C.N. VIII that crosses the acoustic area.
Marks the lateral boundary of the Rhomboid fossa in proximity of the locus ceruleus.
Fissure marking the separation of the pons from the medulla oblongata; point of exit of Cranial Nerves VI, VII and VIII.
Motor nerve; supplies Lateral Rectus.
Mixed nerve; motor innervation for muscles of facial expression and branchiomeric muscles; taste on anterior 2/3 of tongue; supplies sublingual, submandibular and lacrimal glands.
Sensory; Auditory and Vestibular sensory input.
Mixed; contributes to pharyngeal plexus; posterior 1/3 of tongue for taste; carotid sinus; parotid gland.
Mixed; Parasympathetic innervations to organs from neck to transverse colon; motor to laryngeal mm, pharyngeal constrictors, other oral cavity mm (Levator veli palatini, Salpingopharyngeus, Palatoglossus, Palatopharyngeus).