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Risorius Muscle

The risorius muscle is thin and wispy. The angle of the mouth pulled outward by the risorius muscle. This muscle is situated nearby the mouth area and mainly it creates facial expressions.

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
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corrugator supercilii
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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
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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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Origin

Risorius originates via the superficial musculoaponeurotic system which has, parotid fascia, masseteric fascia, platysma, and rarely, via the tendon of masseter muscle, along with a small support via superior fibers of platysma muscle reaching far upwards through the neck. It arises through several layers and attaches within the modiolus.

Risorius Muscle

Risorius Muscle

Insertion

It attaches over the skin on the angle of the mouth via traveling horizontally forward, superficial towards the platysma. It is a thin bundle of fibers which is widest at its origin, but differs in its size and shape. Risorius muscle attaches diagonally within the angle of the mouth and withdraws the angle posteriorly, for example while grinning.

Structure

The risorius originates nearby the parotid gland, a salivary gland posterior to the jaw, and envelops around the platysma muscle. The platysma muscle is found in the chest as well as neck. The risorius spreads out till the skin of the mouth, its point of termination.

Innervation

The facial nerve innervates the risorius muscle.

Action

The risorius operates via expanding and constricting in an upward as well as external movement. The risorius muscle operates together with other facial muscles in order to create a complete facial motion that goes upward and outward as complete part while being in motion superiorly and externally. The motion of all the muscles draws the lips as well as face back in order to create several facial expressions.


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By | 2018-03-26T11:27:00+00:00 March 26th, 2018|Anatomy, Head and Neck, Muscles|0 Comments