"Rectus" is the Latin word meaning "straight" and is used in English to refer to multiple topics in the sciences, including:
In molecular chemistry the ''R'' in the
''R'' & ''S'' isomerism stands for "rectus"
In grammar "casus rectus" is a formal term for
nominative case
In grammar, the nominative case ( abbreviated ), subjective case, straight case, or upright case is one of the grammatical cases of a noun or other part of speech, which generally marks the subject of a verb, or (in Latin and formal variants ...
In mathematics
sine
In mathematics, sine and cosine are trigonometric functions of an angle. The sine and cosine of an acute angle are defined in the context of a right triangle: for the specified angle, its sine is the ratio of the length of the side opposite th ...
is also known as "sinus rectus"
In the classification of the animal kingdom it is the systematic taxonomic name of several species, ''e.g.''
campylobacter rectus &
syllitus rectus
In anatomy it is used to refer to a
rectus muscle Rectus muscle (Latin: , "straight muscle") may refer to:
In the trunk:
* Rectus abdominis muscle
In the eye:
* Inferior rectus muscle
* Lateral rectus muscle
* Medial rectus muscle
* Superior rectus muscle
In the leg:
* Rectus femoris muscle
In ...
, primarily ''e.g.'' the "
rectus abdominis muscle
The rectus abdominis muscle, () also known as the "abdominal muscle" or simply better known as the "abs", is a pair of segmented skeletal muscle on the ventral aspect of a person's abdomen. The paired muscle is separated at the midline by a ba ...
"; in anatomy it can also refer to:
*
Inferior rectus muscle
The inferior rectus muscle is a muscle in the orbit near the eye. It is one of the four recti muscles in the group of extraocular muscles. It originates from the common tendinous ring, and inserts into the anteroinferior surface of the eye. It d ...
*
Superior rectus muscle
The superior rectus muscle is a muscle in the orbit. It is one of the extraocular muscles. It is innervated by the superior division of the oculomotor nerve (III). In the primary position (looking straight ahead), its primary function is elevatio ...
*
Lateral rectus muscle
The lateral rectus muscle is a muscle on the lateral side of the eye in the orbit. It is one of six extraocular muscles that control the movements of the eye. The lateral rectus muscle is responsible for lateral movement of the eyeball, specif ...
*
Medial rectus muscle
The medial rectus muscle is a muscle in the orbit near the eye. It is one of the extraocular muscles. It originates from the common tendinous ring, and inserts into the anteromedial surface of the eye. It is supplied by the inferior division of t ...
*
Musculus rectus thoracis
*
Rectus capitis lateralis muscle
The rectus capitis lateralis, a short, flat muscle, arises from the upper surface of the transverse process of the atlas, and is inserted into the under surface of the jugular process of the occipital bone.
Additional images
File:Rectus capiti ...
*
Rectus femoris muscle
The rectus femoris muscle is one of the four quadriceps muscles of the human body. The others are the vastus medialis, the vastus intermedius (deep to the rectus femoris), and the vastus lateralis. All four parts of the quadriceps muscle attach ...
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