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NEU 5 BRAINSTEM MEDULLA ITS ACCESSORY CRANIAL NERVES
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  • What is the brainstem?

    A stalk-like structure at the basal area of the occipital bone, about the size of a human’s thumb, located infratentorial beneath the cerebrum and in front of the cerebellum.

    anatomy brainstem

  • Where is the brainstem located?

    Located infratentorial, beneath the cerebrum and in front of the cerebellum, immediately rostral to the Foramen Magnum.

    anatomy location

  • What are the main functions of the brainstem?

    Houses nuclei vital for survival, serves as a conduit for ascending sensory and descending motor tracts, and is the attachment point for cranial nerves III to XII.

    functions brainstem

  • What does the clivus support?

    The clivus supports the pons, which is the ventral part of the brainstem.

    anatomy clivus

  • What is the role of the tentorium cerebelli?

    It separates the cerebellum from the occipital lobe and parts of the temporal lobe, acting as an extension of the dura mater.

    anatomy tentorium

  • Which cranial nerves exit the brainstem?

    Cranial nerves III to XII exit the brainstem; I (olfactory) and II (optic) arise from the cerebrum.

    cranial_nerves brainstem

  • What is the anatomical orientation of the brainstem?

    Rostral to the forebrain, posterior to the cerebellum, and caudal to the spinal cord.

    anatomy orientation

  • What are the cuts/views of the brain?

    Coronal, transverse/horizontal, and sagittal cuts; each divides the brain in specific orientations.

    anatomy cuts

  • What is the significance of the ventricular system in the brainstem?

    It is an area within the brainstem that plays a role in the brain's overall anatomy and function.

    anatomy ventricular_system

  • What is CN X?

    Vagus Nerve

    nerves cranial

  • What is CN XI?

    Accessory Nerve

    nerves cranial

  • What is CN XII?

    Hypoglossal Nerve

    nerves cranial

  • What are the divisions of the brainstem from rostral to caudal?

    Midbrain, Pons, Medulla

    anatomy brainstem

  • What is located in the interpeduncular fossa?

    CN III exits, surrounded by cerebral peduncles

    anatomy nerves

  • What do the pyramids of the medulla contain?

    Motor tracts

    anatomy medulla

  • What are the three ventricles at the level of the brainstem?

    Cerebral aqueduct, Fourth Ventricle, Central Canal

    anatomy ventricles

  • What is the Basis pontis?

    Ventral part of the pons containing corticospinal fibers

    anatomy pons

  • What is found at the level above the midbrain?

    Optic Chiasm and Optic Tract

    anatomy midbrain

  • What are the mammillary bodies?

    Part of the limbic system, involved in episodic memory

    anatomy limbic

  • Where does the Oculomotor Nerve exit?

    From the medial area of the interpeduncular fossa

    nerves cn_iii

  • What does the Trochlear Nerve innervate?

    Superior Oblique Muscle (SO4)

    nerves cn_iv

  • What does the pons contain?

    Ascending fibers to the cerebrum and transverse fibers to the cerebellum

    anatomy pons

  • What is the Trigeminal Nerve primarily responsible for?

    Sensory functions in the posteromedial part of pons

    nerves cn_v

  • What are the two divisions of the Trigeminal Nerve?

    Portio Major (sensory) and Portio Minor (motor)

    nerves cn_v

  • What is the sensory function of Portio Major?

    Sensory function

    anatomy nerves

  • What is the motor function of Portio Minor?

    Motor function for muscles of mastication

    anatomy nerves

  • Why is Portio Minor considered a small division?

    Innervates only a few muscles

    anatomy nerves

  • What is the general location of the brainstem?

    Located infratentorial, beneath the cerebrum and in front of the cerebellum, rostral to the Foramen Magnum.

    neuroscience brainstem anatomy

  • What is the size of the brainstem?

    About the size of a human's thumb.

    neuroscience brainstem size

  • What does the ventral portion of the brainstem face?

    Faces the clivus.

    neuroscience brainstem anatomy

  • What is the function of the clivus?

    Serves as the seat of the pons.

    neuroscience anatomy clivus

  • What does the tentorium cerebelli separate?

    Separates the cerebellum from the occipital lobe and parts of the temporal lobe.

    neuroscience anatomy tentorium

  • What structures are continuous with the brainstem?

    Spinal cord.

    neuroscience brainstem anatomy

  • What is the function of the brainstem?

    Houses nuclei vital for survival and serves as a conduit for sensory and motor tracts.

    neuroscience brainstem functions

  • How many cranial nerves exit from the brainstem?

    Ten cranial nerves (III to XII).

    neuroscience cranialnerves brainstem

  • Which cranial nerves arise from the cerebrum?

    Cranial nerves I (olfactory) and II (optic).

    neuroscience cranialnerves cerebrum

  • What anatomical orientations are used for brain cuts?

    Coronal, transverse (horizontal), and sagittal.

    neuroscience anatomy cuts

  • What does a coronal cut divide?

    Divides the brain anteriorly and posteriorly.

    neuroscience anatomy cuts

  • What does a transverse cut divide?

    Divides the brain superiorly and inferiorly.

    neuroscience anatomy cuts

  • What does a sagittal cut divide?

    Divides the brain into left and right parts.

    neuroscience anatomy cuts

  • What is the anatomical term for the superior aspect of the brainstem?

    Cranial or rostral.

    neuroscience anatomy brainstem

  • What is the anatomical term for the inferior aspect of the brainstem?

    Caudal.

    neuroscience anatomy brainstem

  • What does the dorsal aspect of the brainstem refer to?

    Posterior.

    neuroscience anatomy brainstem

  • What does the ventral aspect of the brainstem refer to?

    Anterior.

    neuroscience anatomy brainstem

  • What is CN X?

    Vagus Nerve

    anatomy nerves

  • What is CN XI?

    Accessory Nerve

    anatomy nerves

  • What is CN XII?

    Hypoglossal Nerve

    anatomy nerves

  • What are the divisions of the brainstem from rostral to caudal?

    Midbrain, Pons, Medulla

    anatomy brainstem

  • What does the interpeduncular fossa contain?

    CN III exit, surrounded by cerebral peduncles

    anatomy brainstem

  • What do the pyramids of the medulla contain?

    Motor tracts

    anatomy brainstem

  • What are the three ventricles at the brainstem level?

    Cerebral aqueduct, Fourth Ventricle, Central Canal

    anatomy ventricles

  • What is the Basis pontis?

    Ventral part of the pons, contains corticospinal fibers

    anatomy pons

  • What is the optic chiasm?

    Where nasal fibers cross

    anatomy optic

  • What is the pituitary stalk?

    Median eminence of tuber cinereum, where pituitary gland attaches

    anatomy pituitary

  • What do mammillary bodies do?

    Part of limbic system, episodic memory, Papez circuit

    anatomy limbic

  • What is the interpeduncular fossa?

    Deep depression in midline, contains pituitary stalk and mammillary bodies

    anatomy brainstem

  • What does the Crus cerebri contain?

    Descending motor fibers from cortex

    anatomy motor

  • What is the function of Oculomotor Nerve (CN III)?

    Innervates eye muscles, exits from interpeduncular fossa

    anatomy nerves

  • Where does the Trochlear Nerve (CN IV) exit?

    From midbrain-pons junction, exits posteriorly

    anatomy nerves

  • What does the pons contain?

    Ascending fibers to cerebrum, transverse fibers to cerebellum

    anatomy pons

  • What is the Basilar artery?

    Rests on basilar groove in pons, supplies the pons

    anatomy artery

  • What is the Trigeminal Nerve (CN V)?

    Primarily sensory, consists of Portio Major and Portio Minor

    anatomy nerves

  • What does Portio Major of the Trigeminal Nerve do?

    Sensory function

    anatomy nerves

  • What does Portio Minor of the Trigeminal Nerve do?

    Motor function for muscles of mastication

    anatomy nerves

  • What is the sensory function of the Portio Major?

    Sensory function

    anatomy nervous_system

  • What is the motor function of the Portio Minor?

    Motor function (muscles of mastication)

    anatomy nervous_system

  • Why is the Portio Minor considered a small division?

    Motor function is only minor, innervating only a few muscles

    anatomy nervous_system