Items tagged “snippet”

12 results found
Article

Degenerative disc disease

Degenerative disc disease (DDD) is an exceedingly common entity in the spine, encountered with increasing frequency throughout life and becoming almost universal in late adulthood to a varying degree. It is related to a combination biomechanical stresses and genetic predisposition which alter th...
Article

Breast MRI classification flowchart

The breast MRI classification flowchart (or Tree algorithm) is an evidence-based clinical decision rule to distinguish benign from malignant lesions in breast MRI. It incorporates five diagnostic criteria that are mainly consistent with BI-RADS though assigning diagnostic weights. Diagnostic cr...
Article

Stellate ganglion

The stellate ganglion is formed by the inferior cervical and first thoracic ganglia and is located just anterior to the head of the first rib. It receives input from the paravertebral sympathetic chain and provides sympathetic efferents to the upper limbs, head, neck, and heart. The stellate ga...
Article

Eddy currents

In accordance with Faraday's Law of Induction, rapidly changing gradient magnetic fields can induce stray currents, known as eddy currents, in the surrounding conducting materials. Eddy currents are unwanted as they generate their own magnetic fields, which oppose the original magnetic field vi...
Article

Naso-orbital-ethmoid region

The naso-orbital-ethmoid (NOE) region or interorbital region simply refers to the space between the orbits.  Gross anatomy Boundaries anterior: frontal process of the maxilla, nasal process of frontal bone, nasal bone posterior: sphenoid sinus lateral: medial orbital wall superior: cribrif...
Article

Left ventricular outflow tract

The left ventricular outflow tract (LVOT) is considered represent the region of the left ventricle that lies between the anterior cusp of the mitral valve and the ventricular septum. Its dimensions are often recorded in the TAVI work up studies.  Related pathology left ventricular outflow trac...
Article

Longitudinal versus transverse petrous temporal bone fracture

Petrous temporal bone fractures are classically divided into longitudinal, transverse or mixed fracture patterns depending on the direction of fracture plane with respect to the long axis of the petrous temporal bone. Some features may aid in distinguishing them.                 Longitudinal pe...
Article

Greater (descending) palatine artery

The greater (descending) palatine artery is a branch of the third part of the maxillary artery which passes through the greater palatine foramen to supply most of the hard palate. Gross anatomy After branching off from the third (pterygopalatine) part of the maxillary artery, the greater palat...
Article

Scarpa's fascia

Scarpa's fascia is a membranous layer of superficial fascia that extends over the lower thoracic and anterior abdominal wall, anterior to the midaxillary lines. Here, fibrous septa of subcutaneous tissue are condensed beneath the fat into a thin but strong membrane. The fascia allows the subcuta...
Article

Central nervous system embryology

Central nervous system (CNS) embryology is complex, and below is a brief summary of its development.  The early CNS begins as a simple neural plate that folds to form a groove then tube, open initially at each end. Within the neural tube stem cells generate the two major classes of cells that m...
Article

Testicular descent

Testicular descent occurs after the fourth month of fetal life. The testes are derived from the gonadal ridge medial to the mesonephric ridge of the intermediate cell mass. An elongated diverticulum of the peritoneal cavity, the processus vaginalis precedes the testis through the inguinal canal ...
Article

Preoccipital notch

The preoccipital notch is an indentation approximately 5 cm in front of the occipital pole on the inferolateral boder of the temporal lobe. It is a significant landmark as the occipital lobe lies behind the line joining the preoccipital notch and the parietooccipital sulcus.

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