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Depressor Labii Inferioris

Depressor Labii Inferioris is a facial muscle that is located under the lips, at the chin.  It is also known as the quadratus labii inferioris and the quadratus menti.

Interactive Anatomical Interface

Highlight
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

Highlight
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

Highlight
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
-
Highlight
sternocleidomastoid
trapezius
splenius capitis
longissimus capitis
splenius cervicis
levator scapulae
Epicranial aponeurosis
occipitalis
posterior scalene
splenius capitis
platysma
transversus nuchae

Highlight
sternocleidomastoid
trapezius
splenius capitis
occipitalis
longissimus capitis
splenius cervicis
levator scapulae

Highlight
Epicranial aponeurosis
posterior scalene
semispinalis capitis ( medial fascicle )
splenius capitis
platysma
transversus nuchae
Highlight
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

Highlight
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

Highlight
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 Labii Inferioris

Depressor Labii Inferioris

Structure

The depressor labii inferioris muscle is a quadrangular facial muscle which is found within the jaw area that pulls the lower lip downwards as well as laterally that helps in creating facial expression.

Origin

The depressor labii inferioris originates via anterior of the mandible, deep towards the depressor anguli oris.

Insertion

The fibers travel superiorly and medially, some combine together with fibers via the same muscle on the corresponding part as well as fibers via the orbicularis oris prior to its insertion within the lower lip.

It extends the fibers of the platysma muscle while its own fibers are combined with yellow fat.

Relations

It is reinforced by the other muscles that depress the lip:

  • Risorius
  • Depressor anguli oris

Nerve Supply

The mandibular division of the facial nerve supplies the depressor labii inferioris.

Action

  • It draws lower lip downwards and laterally and displays lower teeth.
  • It helps in order to create facial expressions.
  • It helps in activities like trumpet/saxophone playing and kissing.

Clinical Significance

Generally, the diseases involving the depressor labii inferioris consist of:

  • Myalga
  • Stroke
  • Myopathy
  • Strains
  • Bell’s palsy
  • Lacerations
  • Contusions
  • Infectious myositis
  • Tears
  • Atrophy
  • Neuromuscular diseases

Common signs related to these ailments consist of:

  • Lessened movement of the lip.
  • Loss of muscle control.
  • Muscle spasms.
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By Dr. Joseph H Volker | 2018-08-30T09:37:40+00:00 August 8th, 2018|Anatomy, Head and Neck, Muscles|0 Comments