The brain stem

The brain stem
Consists of
Midbrain
Pons
Medulla oblongata

Principle Brain Arteries

Basic
Strucrure of
Brain Stem
1. Roof Plate
2. Tegmentum
3. Basal Portion

Pons
Ventral (Basilr) surface
Bulbopontine sulcus: from medial to lateral, the abducent, facial and vestibulocochlear nerves appear
Pontopeduncular sulcus: oculomotor N.
Basilar part: pyramids
Basilar sulcus
Middle cerebellar peduncle
Trigeminal nerve
Pontocerebellar trigone: the junction of medulla, pons and cerebellum

Pons
Dorsal surface
Superior cerebellar peduncle
Superior medullary velum
Trochlear nerve

Internal structures
Gray matter
Cranial nerve nuclei
Relay nuclei

Components of Cranial Nerves

Cranial Nerves
Columns of
Brain Stem
Motor Column
1. GSE
2. SVE
3. GVE
Sensory Column
4. VA (GVA & SVA)
5. GSA
6. SSA

Tegmentum of pons directed upward continuation of medulla oblongata
Basilar part
contain both longitudinal and transverse fibers intermixed with pontine nuclei
Internal structures

The characters of internal structure of brain stem

General somatic motor nuclei
Nucleus of abducent n.
Nucleus of hypoglossal n.

General somatic motor nuclei

Special visceral motor nuclei
Motor nucleus of trigeminal n.
Nucleus of facial n.
Nucleus ambiguus
Accessory nucleus

Special visceral motor nuclei

General visceral motor nuclei
Superior salivatory
nucleus
Inferior salivertory nucleus
Dorsal nucleus of vagus n.

General visceral motor nuclei

General somatic sensory nuclei
Pontine nucleus of trigeminal n.
Spinal nucleus of trigeminal n.

General somatic sensory nuclei

Special somatic sensory nuclei
Cochlear nuclei
Vestibular nuclei

Special somatic sensory nuclei

Gracile nucleus
Cuneate nucleus
Inferior olivary nucleus
Superior olivery nucleus
Pontine nucleus
Relay nuclei

Non-cranial nerve nuclei

White matter
Ascending tracts
Medial lemniscus
Spinal lemniscus
Trigeminal lemniscus
Lateral lemniscus

Medial lemniscus

Spinal lemniscus

Trigeminal lemniscus

Lateral lemniscus