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Depressor Anguli Oris

The depressor anguli oris muscle is a short, triangular muscle situated at both sides of the face in the lower jaw, anterior towards the lower jaw. The depressor anguli oris becomes activated at the time of frowning.

Interactive Anatomical Interface

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epicranial aponeurosis
temporalis
auricularis superior
procerus
depressor supercilii
orbicularis oculi
orbicularis oris
depressor anguli oris
mentalis
depressor labii inferioris
nasalis, transverse portion
levator labii superiosis
zygomaticus minor
zygomaticus major
risorius
masseter, superficial
buccinator
digastric
auricularis anterior
temporal Bone
platysma
sternocleidomastoid
sternohyoid
levator scapulae
trapezius
Temporoparietalis
epicranial aponeurosis
ateral nasal cartilage
major alar cartilage
buccal fat pad
ear
eye
corrugator supercilii
frontalis

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epicranial aponeurosis
temporalis
auricularis superior
procerus
depressor supercilii
orbicularis oculi
orbicularis oris
depressor anguli oris
mentalis
depressor labii inferioris
levator labii superiosis
zygomaticus minor
zygomaticus major
risorius
masseter, superficial
buccinator
digastric
auricularis anterior

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temporal Bone
platysma
sternocleidomastoid
sternohyoid
levator scapulae
trapezius
nasalis, transverse portion
Temporoparietalis
epicranial aponeurosis
ateral nasal cartilage
major alar cartilage
buccal fat pad
ear
eye
corrugator supercilii
frontalis
-
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sternocleidomastoid
trapezius
splenius capitis
longissimus capitis
splenius cervicis
levator scapulae
Epicranial aponeurosis
occipitalis
posterior scalene
splenius capitis
platysma
transversus nuchae

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sternocleidomastoid
trapezius
splenius capitis
occipitalis
longissimus capitis
splenius cervicis
levator scapulae

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Epicranial aponeurosis
posterior scalene
semispinalis capitis ( medial fascicle )
splenius capitis
platysma
transversus nuchae
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occipitofrontalis ( epicranius )
temporalis
auricularis superior
obliquus capitis superior
rectus capitis posterior major
rectus capitis posterior minor
semispinalis cervicis
multifidus
levator scapulae
occipital
c07 vertebra
rhomboideus minor
rotatores cervicis
posterior scalene
middle scalene
Sternocleidomastoid
levator scapulae
occipitalis
transversus nuchae
digastric muscle
obliquus capitis
iliocostalis cervicis
rotatores cervicis
platysma
inferior belly of omohyoid muscle

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posterior scalene
middle scalene
Sternocleidomastoid
levator scapulae
occipitalis
rhomboideus minor
rotatores cervicis
transversus nuchae
digastric muscle
obliquus capitis
iliocostalis cervicis
rotatores cervicis
platysma
inferior belly of omohyoid muscle

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occipitofrontalis ( epicranius )
temporalis
auricularis superior
obliquus capitis superior
rectus capitis posterior major
rectus capitis posterior minor
semispinalis cervicis
multifidus
levator scapulae
occipital
c07 vertebra
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Depressor Anguli Oris

Depressor Anguli Oris

Origin

Depressor anguli oris emerges alongside the side of the mandible below the canine, premolar as well as first molar teeth. It has a long, straight starting point via the mental tubercle of the mandible along with its extension, the oblique line, inferiorly as well as laterally towards depressor labii inferioris.

Insertion

Depressor anguli oris attaches within skin and around the corner of the mouth to the upper portion of the orbicularis oris. It depresses the angle of the mouth.

Structure

It is a short, triangular muscle which is situated at both sides of the face. Together with orbicularis oris as well as risorius, it merges within a narrow fasciculus which combines at the angle of the mouth; and several fibres extend within levator anguli oris.

Depressor anguli oris is constant inferiorly to platysma as well as cervical fasciae. A few fibres can travel inferior to the mental tubercle and traverse the midline in order to intertwine with their corresponding fellows and create transversus menti as a result.

Variations

Some babies are born without this muscle on one part of their face, which makes only one part of their mouth descend whenever they make sad expression. Though, as they mature, this form becomes invisible.

Artery Supply

The inferior labial branch of the facial artery as well as the mental branch of the maxillary artery supply depressor anguli oris.

Innervation

The buccal and mandibular divisions of the facial nerve innervate the depressor anguli oris.

Actions

Depressor anguli oris pulls the angle of the mouth inferiorly and laterally at the time of opening the mouth as well as in expressing unhappiness. At the time of opening of the mouth, the mentolabial sulcus becomes more horizontal and its central portion excavates.


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By | 2018-03-26T11:31:39+00:00 March 26th, 2018|Anatomy, Head and Neck, Muscles|0 Comments