Basis Anatomy

Basis Anatomy

Definition

• Basis refers to the inferior (lower) surface of the brain
• Also known as the base of the brain

Structures

• Frontal lobe:
  • Orbital surface (inferior surface of the frontal lobe)
  • Olfactory bulb and tract
• Temporal lobe:
  • Inferior surface of the temporal lobe
  • Uncus (part of the parahippocampal gyrus)
• Cerebellum:
  • Inferior surface of the cerebellum
  • Anterior lobe (part of the cerebellum)
• Brainstem:
  • Inferior surface of the midbrain, pons, and medulla oblongata
  • Cranial nerves III-XII emerge from the basis

Features

• Cisterns:
  • Cerebellomedullary cistern (between cerebellum and medulla oblongata)
  • Pontine cistern (around the pons)
• Blood vessels:
  • Basilar artery
  • Vertebral arteries
  • Posterior inferior cerebellar arteries (PICA)
• Other:
  • Foramen magnum (opening at the base of the skull)
  • Occipital bone (forms the posterior part of the basis)

Basis Anatomy

Definition and Overview

• The basis refers to the inferior (lower) surface of the brain, also known as the base of the brain

Brain Structures

• The frontal lobe has an orbital surface and contains the olfactory bulb and tract
• The temporal lobe has an inferior surface and features the uncus, part of the parahippocampal gyrus
• The cerebellum has an inferior surface and an anterior lobe
• The brainstem consists of the inferior surface of the midbrain, pons, and medulla oblongata, and is where cranial nerves III-XII emerge

Features of the Basis

• The cerebellomedullary cistern is located between the cerebellum and medulla oblongata
• The pontine cistern surrounds the pons
• The basilar artery and vertebral arteries are key blood vessels in the basis
• Posterior inferior cerebellar arteries (PICA) supply the cerebellum
• The foramen magnum is an opening at the base of the skull
• The occipital bone forms the posterior part of the basis

Learn about the inferior surface of the brain, including the frontal lobe, temporal lobe, cerebellum, and brainstem. Identify key structures and their functions.