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23 Cards in this Set
- Front
- Back
Boundaries of Anterior Triangle
|
Superior: Inferior border of mandible.
Posterior: SCM muscle Inferior: Anterior midline of neck |
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Subdivisions of Anterior Triangle
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1) Submental triangle
2) Submandibular triangle 3) Muscular triangle 4) Carotid Triangle |
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Structures that divide the Anterior triangle into further sub-triangles
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1) Anterior Belly of Digastric M.
2) Posterior Belly of Digastric M. 3) Hyoid Bone 4) Omohyoid Muscle |
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Anterior Belly of Digastric Muscle
[origin, insertion, innervation, function] |
Origin: Digastric fossa of mandible
Insert: Intermediate tendon of body Greater horn of hyoid bone. Nerve: Mylohyoid nerve (V3-mand.) Function: Depresses jaw Raise hyoid bone + stab. it when swallowing and speaking |
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Posterior Belly of Digastric Muscle
[origin, insertion, innervation, function] |
Origin: Mastoid notch (temp. bone)
Insert: Intermediate tendon of body Greater horn of hyoid bone. Nerve: Facial Nerve (CN VII) Function: Depresses jaw Raise hyoid bone + stab. it when swallowing and speaking |
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(Skin)
(Superficial Cervical Fascia) Platysma [origin, insertion, innervation, function] |
Origin: fascia (clavicle+superior
parts of pec. major/deltoid) Insert: inferior border of mandible skin, subcutaneous tissue of lower face Nerve: Facial n. (cervical branch) Function: draws corner of mouth inferior+lateral (sad face) -tenses skin of neck. |
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Components of Deep Cervical Fascia
and function |
1) Investing Fascia
2) Pretracheal Fascia 3) Prevertebral Fascia Function: support viscera, muscles, vessels, deep lymph nodes |
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Submental Triangle
[boundaries] |
Inferior: body of hyoid bone
Lateral: Ant. Bellies of digastric m. Floor: Mylohyoid Muscle |
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Submental Triangle
[contents] |
1) Mylohyoid muscle
2) Mylohyoid nerve 3) Hyoid bone 4) veins that unite anterior jugular veins |
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Submandibular Triangle
[boundaries] |
Hypotenuse: Lower border of mandible
Two Legs: Digastric M. (Anterior/Posterior) |
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Submandibular Triangle
[Floor] |
1) mylohyoid muscle
2) hyoglossus muscle 3) Middle pharyngeal constrictor m. |
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Mylohyoid Muscle
[origin, insert,innervation, function] |
Origin: Mylohyoid midline of mandible
Insert: Raphe + body of hyoid bone. Nerve: Mylohyoid N. (V3) Function: Elevates hyoid bone, floor of mouth, and tongue during speakin/swallowin |
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Hyoglossus M.
[origin, insert,innervation, function] |
Origin: Body + greater horn of hyoid
Insert: inferior + lateral tongue Nerve: hypoglossal n. (CN XII) Function:depresses+retracts tongue |
|
Middle Pharyngeal Constrictor Muscle.
[origin, insert,innervation, function] |
Origin: Stylohyoid ligament
greater/lesser horns of hyoid Insert: median Raphe of Pharynx Nerve: spinal accessory n. via vagus (CN XI via X) Function: Constricts pharynx wall during swallowing. |
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Submandibular Triangle
[Contents] |
Mylohyoid n.
Hypoglossal n. Submandibular gland Facial Veins + Arteries |
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Muscular Triangle
[Boundaries] |
Superior Belly of Omohyoid
SCM Midline of Neck |
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Muscular Triangle
[Contents] |
Infrahyoid muscles (sternohyoid, omohyoid, sternothyroid, thyrohyoid)
Parathyroid Thyroid Larynx Trachea Left/Right Recurrent Laryngeal N. Anterior Jugular Vein |
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Sternohyoid
|
Origin: Manubrium + Medial end of Clavicle
Insert: body of hyoid bone Nerve: Ansa Cervicalis Fcn: Depresses hyoid bone |
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Omohyoid
|
Origin: Sup. border of Scapula (near suprascapular notch)
Insert: Inf. border of hyoid bone Nerve: Ansa Cervicalis Fcn: Depresses, retracts, steadies hyoid bone |
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Sternothyroid
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Origin: posterior manubrium + 1st costal cartilage
Insert: Oblique line of thyroid cartilage Nerve: Ansa cervicalis Fcn: Depresses hyoid + elevates larynx |
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Thyrohyoid
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Origin: Oblique line of thyroid cartilage
Insert: inferior body + greater horn of hyoid bone Nerve: C1 via Hypoglossal N (CN XII) Fcn: depresses hyoid bone + elevates larnyx. |
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Carotid Triangle
[boundaries] |
Superior omohyoid m.
SCM Posterior belly of digastric m. |
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Carotid Triangle
[contents] |
Carotid Sheath (internal jugular vein, common carotid, vagus n)
External Carotid (and branches) Superior Laryngeal N (Internal/External) Hypoglossal N Ansa Cervicalis Spinal Accessory . (CN XI) 4 nerves + carotid. |