Podcast
Questions and Answers
The internal capsule appears V shaped in horizontal section, looking laterally.
The internal capsule appears V shaped in horizontal section, looking laterally.
True
The anterior part of the anterior limb of the internal capsule is supplied by the Middle Cerebral Artery.
The anterior part of the anterior limb of the internal capsule is supplied by the Middle Cerebral Artery.
False
Cortico-spinal fibres are located in the genu of the internal capsule.
Cortico-spinal fibres are located in the genu of the internal capsule.
False
The retrolentiform part of the internal capsule contains auditory radiation.
The retrolentiform part of the internal capsule contains auditory radiation.
Signup and view all the answers
The internal capsule is composed of both white and gray matter.
The internal capsule is composed of both white and gray matter.
Signup and view all the answers
The lentiform nucleus is separated from the head of the caudate by the posterior limb of the internal capsule.
The lentiform nucleus is separated from the head of the caudate by the posterior limb of the internal capsule.
Signup and view all the answers
The amygdaloid nucleus is primarily involved in the processing of smell.
The amygdaloid nucleus is primarily involved in the processing of smell.
Signup and view all the answers
The claustrum is located between the lentiform nucleus and the insula, and its function is well understood.
The claustrum is located between the lentiform nucleus and the insula, and its function is well understood.
Signup and view all the answers
The lentiform nucleus is composed of the globus pallidus and putamen.
The lentiform nucleus is composed of the globus pallidus and putamen.
Signup and view all the answers
The caudate nucleus is located outside the central nervous system (CNS).
The caudate nucleus is located outside the central nervous system (CNS).
Signup and view all the answers
Study Notes
Internal Capsule (Projection Fibers)
- The internal capsule is a wide sheet of white matter composed of projection fibers.
- It's called "internal" because it's located between the lentiform nucleus and the thalamus.
- The internal capsule has a V-shaped appearance in horizontal sections.
- Medially, it is adjacent to the head of the caudate nucleus and the thalamus.
- Laterally, it is adjacent to the lentiform nucleus.
Projection Fibers
- Projection fibers transmit signals from the thalamus to the cerebral cortex (thalamic radiation).
- They also transmit signals from the cerebral cortex to lower centers (e.g., pyramidal tract).
Definition
- The internal capsule is a broad lamina of white matter composed of projection fibers.
- It's named as such because it forms a capsule surrounding the lentiform nucleus.
Relations
- Medially: head of the caudate nucleus and thalamus.
- Laterally: lentiform nucleus.
Parts
- Anterior limb
- Genu
- Posterior limb
- Retrolentiform part
- Sublentiform part
Descending Tracts (Anterior Limb)
- Fronto-pontine fibers
- Corticonuclear tract
- Corticospinal tract (upper limb and trunk)
- Corticospinal tract (lower limb)
- Corticorubral tract
Descending Tracts (Genu)
- Corticobulbar fibers (nuclear fibers)
Descending Tracts (Posterior Limb)
- Corticospinal fibers
- Fronto-pontine fibers
- Corticonuclear tract
- Corticospinal tract (upper limb and trunk)
- Corticospinal tract (lower limb)
- Corticorubral tract
- Parietppontine, temporopontine, & occipitopontine fibers
Descending Tracts (Retro-lentiform)
- Parietpo-pontine & occipitopontine fibers
Descending Tracts (Sublentiform)
- Temporopontine fibers
Ascending Tracts (Anterior Limb)
- Anterior thalamic radiation
- Frontopontine fibers
Ascending Tracts (Posterior Limb)
- Posterior thalamic radiation (optic radiation)
- Frontopontine fibers
- Corticonuclear tract
- Corticospinal tract (upper limb and trunk)
- Corticospinal tract (lower limb)
- Superior thalamic radiation
Ascending Tracts (Retro-lentiform)
- Parietopontine, temporopontine & occipitopontine fibers
- Acoustic radiation
Ascending Tracts (Sublentiform)
- Inferior thalamic radiation (auditory radiation)
Blood Supply
- Anterior part of anterior limb: Anterior Cerebral Artery
- Posterior part of anterior limb, genu, and anterior part of posterior limb: Middle Cerebral Artery
- Posterior part of posterior limb, retrolentiform and sublentiform part: Anterior Choroidal Artery
Basal Nuclei
- The basal nuclei are collections of nerve cells located deep within the cerebral hemispheres.
- They are important for motor control.
Basal Nuclei Components
- Caudate nucleus: located medial to the lentiform nucleus
- Lentiform nucleus: lateral to the caudate nucleus; consists of the globus pallidus and putamen.
- Amygdaloid nucleus: positioned at the anterior end of the tail of the caudate nucleus; involved in processing olfactory sensory information
- Claustrum: a thin sheet of gray matter between the lentiform nucleus and the insula.
Amygdaloid Nucleus
- Small rounded mass in the uncus of the temporal lobe.
- Considered the smell center.
Claustrum
- Thin sheet of gray matter lying between the lentiform nucleus and the insula.
- Related laterally to the external capsule that separates it from the insula.
- Its function is currently unknown.
Horizontal Section of the 2 Cerebral Hemispheres
- Shows the internal capsule's relationship to various brain structures, like the caudate nucleus, putamen, globus pallidus, and the ventricles.
Thalmus
- A significant relay station in the brain.
- The thalamus process sensory, motor, and other brain signals to the cerebral cortex.
MCQ's
- These are multiple-choice questions regarding the internal capsule and anterior commissure.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz explores the internal capsule, a significant structure in the brain composed of projection fibers. You'll learn about its location, anatomy, and the role of projection fibers in connecting the thalamus and cerebral cortex. Test your knowledge and understanding of this crucial neuroanatomical feature.
