Items tagged “snippet”

52 results found
Article

Triangle of Guillain and Mollaret

The triangle of Guillain and Mollaret, also known as the dentatorubro-olivary pathway, has three corners 1: red nucleus inferior olivary nucleus contralateral dentate nucleus Rubro-olivary fibers descend from the parvocellular division of each red nucleus along the central tegmental tracts t...
Article

Pellegrini-Stieda lesion

Pellegrini-Stieda lesions are ossified post-traumatic lesions at (or near) the medial femoral collateral ligament adjacent to the margin of the medial femoral condyle. One presumed mechanism of injury is a Stieda fracture (avulsion injury of the medial collateral ligament at the medial femoral c...
Article

Meynert's commissure

Meynert’s commissure, also called the dorsal supraoptic commissure, is one of three tracts that comprise the supraoptic commissure 1,2. The remaining two tracts that comprise the supraoptic commissure are Gudden’s commissure (ventral supraoptic decussation) and the anterior hypothalamic commissu...
Article

Nucleus accumbens

The nucleus accumbens (NAc) (colloquially known as the pleasure center) is a small region in the forebrain below the corpus striatum. It is involved in the reward pathway and is therefore involved in impulse control disorders. Summary It is located in the basal ganglia below the corpus striatu...
Article

Ionizing radiation

Ionizing radiation is the term given to forms of radiation that are energetic enough to displace orbiting electrons from the atoms in the absorbing medium, thus forming positive ions.  Forms of ionizing radiation Indirect Indirect ionizing radiation involves uncharged particles. X-rays and ga...
Article

Suprabullar recess

The suprabullar recess is a potential opening (cleft) between the bulla lamella and skull base located along the posterior margin of the frontal recess with which it may communicate directly. It is present when the bulla lamella is incomplete superiorly. The term ​sinus lateralis is sometimes u...
Article

Retrobullar recess

The retrobullar recess is a small potential opening (cleft) rather than an actual air cell located superior and posterior to the ethmoid bulla, separating it from the skull base and basal lamella. Gross anatomy It is bordered: anteriorly by the posterior wall of the ethmoid bulla posteriorly...
Article

Lamina papyracea

The lamina papyracea, also known as the orbital lamina of the ethmoid bone, is the principal component of the medial wall of the orbit, and also the lateral surface of the ethmoid air cells. Gross anatomy It articulates: superiorly with the orbital plate of the frontal bone inferiorly with t...
Article

Spinal canal

The spinal canal, also known as the vertebral canal, is the cavity within the vertebral column which contains the spinal cord. Gross anatomy The spinal canal becomes progressively narrower from its superior opening at the foramen magnum to its inferior opening at the sacral hiatus 1. The canal...
Article

Thoracoepigastric vein

The thoracoepigastric vein provides a communication between the superficial epigastric vein and the lateral thoracic vein as it ascends superficially on anterolateral chest and abdominal wall. It, therefore, drains into both the superior vena cava via the axillary vein and the inferior vena cava...
Article

Left perihepatic space

The left perihepatic space (also known as the left subhepatic space) is a potential space located between the stomach and the visceral surface of left lobe of the liver. Gross anatomy The left perihepatic space can be further subdivided into anterior and posterior spaces. It is a subcompartmen...
Article

Hip (Von Rosen view)

The Von Rosen view also known as the abduction-internal rotation view (AIR view) is a radiographic projection of the hip that demonstrates the relationship between the femoral head and the acetabulum. The von Rosen view is used in the diagnosis of developmental dysplasia of the hip in pediatric...
Article

Laryngeal vestibule

The laryngeal vestibule is the part of the laryngeal cavity lying between the laryngeal inlet and vocal folds. It is found within the supraglottis. It has a wedge-shaped cross-section, its base lying anteriorly, with its apex tapering posteriorly.  Relations anterior: tubercle of the epiglotti...
Article

Killian dehiscence

The Killian dehiscence is a triangular shaped area of weakness in the muscular wall of the pharynx, between the transverse and oblique bundles of the inferior pharyngeal constrictor 1. Gross anatomy It is located in the posterior wall of the laryngopharynx, slightly above the origin of the eso...
Article

Fast spin echo

Fast or turbo spin echo (FSE/TSE) is an adaptation of conventional spin-echo (SE) acquisition technique designed to reduce imaging time. It has largely supplanted the original spin-echo technique due to vastly improved imaging speed. Basic spin echo sequence In a basic SE sequence, a single ec...
Article

Endometrium

The endometrium refers to the inner lining of the uterine lumen, composed of endometrial glands surrounded by loose highly cellular connective tissue. Gross anatomy Layers In women of reproductive age, the endometrium is composed of two layers: stratum basale (basal layer): describes the de...
Article

Laryngeal ventricle

The laryngeal ventricle is a slitlike, mucosa-lined, space located between the true and false vocal cords. It is often seen on lateral radiographs of the neck as an air-filled space between the true and false vocal cords. It should not be confused with the laryngeal vestibule. See also laryng...
Article

Laryngeal saccule

The laryngeal saccule is a mucosa-lined sac or pouch that arises from the anterior aspect of the roof of the laryngeal ventricle. It is most prominent in newborn but involutes during childhood. Relations medial: false vocal cords lateral: thyroid cartilage Related pathology Dilatation of th...
Article

Right marginal artery

The right marginal artery, also known as the right intermediate atrial branch, supplies the surrounding right atrial tissues 1,2 and, in 10-15% of cases, provides the main arterial supply to the sinus node 3,4. Terminology It also sometimes known as a the acute marginal artery or margo acutus ...
Article

Tympanosquamosal suture

The tympanosquamosal suture or fissure separates the tympanic part of the temporal bone from the squamous part. It is parallel and anterior to the bony external auditory meatus and medially continuous with the petrotympanic fissure and petrosquamous fissure.

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