Anatomy Bones and Muscles · MU Pleven

146. System for touch and pressure connected with the trigeminal nerve.

Covers the limbic system's structures, including the hippocampal formation, amygdala, fornix, hypothalamus and thalamus, and their connections. Walks through olfaction, memory via the Papez circuit, and feeding, with a list of white matter tracts linking limbic structures and a step-by-step outline of the Papez circuit and its collaterals.

Inside: 6 sections · 7 labelled pictures · 10 flashcards · 5 min

Topic 145 of 236 in the MU Pleven syllabus for Anatomy Bones and Muscles (Medicine, Year 2). The free AceMed note covers it in 6 sections, about 659 words (5 min of reading), with 10 flashcards.

In this note

  1. Introduction
  2. LIMBIC SYSTEM → Starts & terminate in hippocampus
  3. Structures :
  4. Functions :
  5. Connections between the limbic structures :
  6. The papez circuit :

LIMBIC SYSTEM → Starts & terminate in hippocampus

  • The limbic system is composed of several cortical and subcortical structures, that participate in a complex network of connections to regulate complicate behaviors such as memory, emotions, hemostatic functions and motivational state. (group of white & grey mater structures)

(medial view)

Structures :

  1. 1. Limbic lobe : 2 components → BA 23,24,25,29,30,31
  • Cingulate gyrus (memory+emotions)
  • Parahippocampal gyrus (memory)
  1. 2. Hipocampal formation : (memory).
  • Located within the medial temporal lobe.
  • Made up from:
  1. 1. Hippocampus (curved structures).
  • converting short term memory to long term memory.
  1. 2. Dentate gyrus: lies between the parahippocampal gyrus & the hippocampus.
  2. 3. Subiculum : transitional area btw. the parahippocampal gyrus & the hippocampus.

* The efferent fibers arising from the hippocampus form a thin layer of white matter called alveus, which converge to form a bundle called fimbria which becomes continuous with the crus of the fornix.

  1. 3. Fornix: An arching band of white matter that connects the hippocampus to hypothalamus (mamillary bodies
  • Consists of 3 parts:
  1. 1. Crus - begins from the fimbria of hippocampus
  2. 2. Body - Below corpus callosum (behind the body is the fornix commissure)
  3. 3. (2) Ant. columns - end in mammillary bodies.
  4. 3. Amygdala : (emotions of fear & behaviour) — Inside the uncus gyrus
  • The largest nucleus - Is an almond-shaped structure.
  • Consists of 3 nuclear regions:
  • large basolateral group
  • Small corticomedial group (olfaction).
  • which includes the central nucleus.
  1. 4. Hypothalamus : located below the thalamus & above the pituitary gland.

Contains: Mammillary bodies

  1. 5. Thalamus: directing sensory info. to the appropriate areas"

Contains.

  • Ant. nucleus.
  • Medialodorsal nucleus.
  1. 6. Septum - beneath the rostral pt. of the corpus callosum
  2. 7. Habenula

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