notch (redirected from Mastoid notch)

notch (noch) incisure; an indentation on the edge of a bone or other organ.

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aortic notch  dicrotic n.

cardiac notch 

1. (of stomach) a notch at the junction of the esophagus and the greater curvature of the stomach.

2. (of left lung) a notch in the anterior border of the left lung.

dicrotic notch  a small downward deflection in the arterial pulse or pressure contour immediately following the closure of the semilunar valves and preceding the dicrotic wave, sometimes used as a marker for the end of systole or the ejection period.

mastoid notch  a deep groove on the medial surface of the mastoid process of the temporal bone, giving attachment to the posterior belly of the digastric muscle.

parotid notch  the notch between the ramus of the mandible and the mastoid process of the temporal bone.

Rivinus' notch , tympanic notch a defect in the upper tympanic part of the temporal bone, filled by the upper portion of the tympanic membrane.

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notch (nch)

n.

1. An indentation at the edge of a structure; an incisure.

2. An upstroke or peak on a pulse tracing.

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notch

Etymology: Fr, noche

an indentation or a depression in a bone or other organ, such as the auricular notch or the cardiac notch.

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notch,

n an indentation.

notch, buccal,

n the notch in the flange of a denture that accommodates the buccal frenum.

notch, coronoid

n greatest concavity on the anterior border of the ramus of the mandible.

notch, hamular,

n See notch, pterygomaxillary.

notch, labial,

n the notch in the labial flange of a maxillary or mandibular denture that accommodates the labial frenum.

notch, mandibular,

n a semicircular depression located on the mandible between the condyle and the coronoid process. Fibers arise from the anterior edge of the temporalis to form a distinct muscle, the temporalis minor, that inserts onto the mandibular notch.

notch, pterygomaxillary

n (hamular notch), the notch or fissure formed at the junction of the maxilla and the hamular, or pterygoid, process of the sphenoid bone.

notch, sigmoid,

n the concavity on the superior surface of the ramus of the mandible lying between the coronoid and condyloid processes.

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notch

an indentation, especially one on the edge of a bone or other organ.

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acetabular notch

in the medial part of the rim of the acetabulum.

antitragohelicine notch

in the caudal process of the cartilage of the pig's ear separating it from the tragus and antitragus.

aortic notch

a small downward deflection in the arterial pulse or pressure contour immediately following the closure of the semilunar valves, sometimes used as a marker for the end of systole or the ejection period. Called also dicrotic notch.

cardiac notch

an indentation in the ventral margin of the lungs that allows the heart in its coverings to lie against the chest wall. Useful for ultrasound examination, auscultation, pericardiac and cardiac puncture. The extent of the notch varies between species and enlarges during expiration.

costal notch

indentations in the sternum with which the costal cartilages of the ribs articulate.

dicrotic notch

see aortic notch (above).

glenoid notch

in the cranial part of the rim of the glenoid cavity of the scapula.

greater sciatic notch

indentation in the dorsal edge of the ilium over which the sciatic nerve passes.

intertragic notch

the notch in the auricular cartilage between the tragus and antitragus.

lesser sciatic notch

indentation in the lateral border of the ischium between the ischial spine and the ischial tuber.

mandibular notch

separates the coronoid and condylar processes of the mandible.

mandibular vascular notch

the notch on the lower edge of the mandible below which facial vessels cross to reach the face in some species such as the horse.

nasoincisive notch

deep notch separating the pointed nasal bone and the incisive bone.

pretragic notch

the palpable depression rostral to the tragus of the ear.

tragohelicine notch

the slot in the auricular cartilage between the tragus and the medial border of the ear cartilage; a useful surgical landmark.

vertebral notch

the notch in the pedicle of the vertebral arch, at the cranial and caudal ends of each vertebra which combines with its opposite number to create an intervertebral foramen.