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Temporalis Muscle

The temporalis muscle arises alongside the temporal lines of the parietal bone of the skull and it is a fan-shaped muscle. The muscle is located inside the temporal fossa. A robust fibrous aponuerotic sheath known as the temporalis fascia encloses it and travels medial towards the zygomatic arch.

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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Origin

It arises via:

  • Entire floor of temporal fossa, with the exception of the portion created through the zygomatic bone.
  • Deep surface belonging to the temporal fascia.
Temporalis Muscle

Temporalis Muscle

Insertion

The fibres merge and travel downwards in order to create a tendon that travels via the opening in the middle of the zygomatic arch as well as the side of the skull. The muscle is attached into:

  • The medial surface, apex, and anterior margin of the coronoid process of ramus of mandible.
  • The anterior margin of the ramus of mandible, nearly till the last molar tooth.

Fiber orientation

  • The anterior fibres are set perpendicularly
  • The most posterior fibres are set nearly horizontally.
  • Intervening intermediate fibres are set obliquely.

Structure

The muscle thickness differs from 5 mm alongside its periphery to 15 mm at the zygomatic arch plane. The general area of muscle is 10 cm in width and 20 cm in length.

Temporalis Fascia

The temporalis muscle is enclosed through a thick, tough fascia known as the deep temporalis fascia that is constant with the periosteum of the skull. A few fibers of the temporalis muscle originate via this fascia.

The deep temporalis fascia divides within superficial and deep layers which afterwards attach within the superficial as well as deep parts of the superior part of the zygomatic arch, on the temporal line of fusion, a few centimeters superior towards the zygomatic arch. In the middle of these two layers a wedge-shaped, superficial temporal fat pad is located on the superior surface of the zygomatic arch.

Relations

  1. Middle (deep) temporal artery is a branch of superficial temporal artery that travels on the temporal fossa deep towards temporalis muscle and circulates the temporalis muscle and fascia.
  2. The temporal region is the zone lateral towards the skull in the middle of the temporal line and zygomatic arch. It is the location where the temporalis muscle attaches.
  3. Temporalis is attached to the ramus of mandible and it is inserted at the coronoid process on its apex, anterior margin, as well as inner surface.
  4. The major muscles present in the infratemporal fossa are – Lateral pterygoid, medial pterygoid, and tendon of temporalis.
  5. Lateral pterygoid muscle is superficially related to Tendon of temporalis.
  6. Deep temporal arteries which are usually two in number are branches of maxillary artery; rise up on the lateral aspect of the skull deep to the temporalis muscle, which they supply.
  7. Deep temporal nerves which are branches of mandibular nerve usually are found two in number, anterior and posterior. The anterior and posterior temporal nerves in order to supply the temporalis muscle from its deep aspect emerge at the upper margin of the lateral pterygoid and rise up in the temporal fossa.

Nerve Supply

The anterior and posterior deep temporal nerves supply the temporalis muscle.

Actions

The temporalis muscle raises the mandible and so seals the mouth and brings the teeth closer to each other. This movement needs the perpendicular pull of the anterior fibres as well as posterior pull of the posterior fibres. Posterior fibres withdraw the mandible afterwards its protrusion.

Clinical Significance

Palpation

The muscles of chewing and their motor nerve supply can be examined clinically via clasping the teeth constantly and afterwards examining the temporalis and masseter in the temporal fossa and superior to the ramus of mandible, correspondingly.

Temporomandibular Joint Syndrome

This syndrome consists of symptoms arising via temporomandibular joints and related masticatory muscles. General symptoms are:

  • Diffuse facial pain – spasm of masseter muscle.
  • Headache – spasm of temporalis muscle.
  • Jaw pain – spasm of lateral pterygoid.

Symptoms in the joint may be related to clicking and pain. The clicking is frequently audible while the patient is chewing. It arises whenever the posterior connection of the disc becomes strained or separated, making the disc momentarily or permanently confined in anterior portion. The instability of articular disc emerges via an overclosure or malocclusion.


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By | 2018-03-26T11:19:59+00:00 March 26th, 2018|Anatomy, Head and Neck, Muscles|0 Comments