TABLE OF CONTENTS
1. Anterior Brainstem
2. Posterior Brainstem
3. Internal Brainstem
4. Practice Questions
Superficial
Brainstem
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Brainstem Anatomy: Structure, Function, and Clinical Correlations, Study Guides, Projects, Research of Neuroanatomy
A detailed overview of brainstem anatomy, covering external and internal structures. It includes descriptions of the midbrain, pons, and medulla, with components like cerebral peduncles, colliculi, and cerebellar peduncles. The document discusses the functions of brainstem structures and their clinical relevance, illustrated by a tectal plate glioma case study. Key features like pyramids, olives, and the reticular formation are explained, enhancing understanding of brainstem functions and clinical implications. The document concludes with practice questions to reinforce learning and assess comprehension. This resource is valuable for medical students and healthcare professionals seeking to deepen their knowledge of brainstem anatomy and its clinical significance.
Typology: Study Guides, Projects, Research
2024/2025
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TABLE OF CONTENTS
1. Anterior Brainstem
2. Posterior Brainstem
3. Internal Brainstem
4. Practice Questions
Superficial
Brainstem
OUTLINE
Brainstem โ Midbrain โ Pons โ Medulla
External Anterior Surface โ Cerebral peduncles โ Interpeduncular fossa โ Mammillary bodies โ Infundibulum โ Olives โ Pyramid โ Anterior median fissure โ Ventro-lateral sulcus
Brainstem
REVIEW
External Posterior Surface โ Superior colliculi โ Inferior colliculi โ Superior cerebellar peduncles โ Middle cerebellar peduncles โ Inferior cerebellar peduncles โ Posterolateral sulcus โ Posterior intermediate sulcus โ Posterior median sulcus โ Facial colliculus โ Fasciculus gracilis โ Gracile tubercle โ Fasciculus cuneatus โ Cuneate tubercle
Internal Structures โ Cerebral aqueducts โ Tectum โ Tegmentum โ Ascending tracts โ Descending tracts โ Reticular formation
Brainstem Anatomy Overview
The brainstem is divided into three
general areas:
- Midbrain
- Pons
- Medulla
Anterior Surface Anatomy
Cerebral Peduncles
Pituitary gland
Mammillary bodies
Interpeduncular fossa
Infundibulum
โ Infundibulum: connection between hypothalamus and
pituitary gland
โ Cerebral peduncles: contain corticospinal and
corticobulbar motor tracts
โ Mammillary bodies: involved in memory (Mam=Mem)
โ Pyramids: contain corticospinal and corticobulbar motor
tracts
โ Pyramidal decussation: crossing over of descending
motor fibers
โ Olives: coordinate signals from the spinal cord to the
cerebellum to regulate motor coordination and learning
Posterior Surface Anatomy
Superior Colliculus
Inferior Colliculus
Superior Cerebellar
Peduncles
Inferior Cerebellar
Peduncles
Middle Cerebellar
Peduncles
4th Ventricle
โ Superior colliculus: involved in the visual reflex
pathway
โ Inferior colliculus: involved in the auditory
pathway
โ Superior cerebellar peduncle: connects the
midbrain to the cerebellum
โ Middle cerebellar peduncle: connects the pons to
the cerebellum
โ Inferior cerebellar peduncle: connects the
medulla to the cerebellum
โ Facial colliculus: superficial to the facial nucleus
fibers
โ Fasciculus gracilis: carries DCML sensory info
from lower limbs
โ Fasciculus cuneatus: carries DCML sensory info
from upper limbs
โ Gracile tubercle: contains the nucleus gracilis
โ Cuneate tubercle: contains the nucleus cuneatus
Internal Brainstem Anatomy
โ Ascending tracts: Anterolateral Spinothalamic tracts, Dorsal
Column-Medial Lemniscus tracts, and Spinocerebellar tracts
carrying conscious and unconscious sensory information from
the body to higher cortical areas
โ Descending tracts: Corticospinal and Corticobulbar tracts
carrying motor information from motor cortex to face and body
โ Reticular formation: interconnected nuclei spanning the
brainstem which are involved in somatic motor control,
cardiovascular control, pain modulation, sleep and
consciousness, and habituation
Case Study
A 10-year child presents after months complaining of
persistent headaches in the morning, nausea, vomiting,
and fatigue. Recently they reported having abnormal eye
movements and delayed auditory reflexes. You order an
MRI to confirm your diagnosis and this is what you findโฆ
A grade I tectal plate glioma:
โ The tectal area contains the superior and inferior
colliculi which are involved in the visual pathways
and auditory reflexes, respectively.
โ Headaches, nausea and fatigues are due to the
increased intracranial pressure caused by the
compression and closure of the cerebral aqueduct
preventing the flow of CSF.
Practice Questions
1. What function is structure A
involved in?
2. What type of information is
being carried through structure
B?
A
B
Summary and Learning Outcomes
- Identify external anatomy of the brainstem
- Identify internal anatomy of brainstem
- Describe basic function of internal and
external anatomy of brainstem