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Head and Neck Anatomy

Splenius Cervicis Anatomy: Origin, Insertion, Action, Innervation

Splenius Cervicis Anatomy Study Origin: Spinous processes and supraspinous ligaments of T3 to T6 Insertion: Posterior tubercles of transverse processes of C1 to C3 Action: Extention of the cervical spine,Lateral flexion of the cervical spine, Rotation of the cervical spine Innervation: Dorsal primary rami of C5 to C7 Blood Supply: Superior intercostal artery via the…

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Splenius Capitis Anatomy: Origin, Insertion, Action, Innervation

Splenius Capitis Anatomy Origin: Lower half of the nuchal ligament, the spinous processes and supraspinous ligaments of C7 to T3 Insertion: Lateral occipital bone, between the superior and inferior nuchal lines Action: Extends the head and cervical spine, Lateral flexion of the head and cervical spine Innervation: Dorsal Rami of (C3, C4) Blood Supply:  Descending branches of the occipital…

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Scalenes Anatomy: Origins, Insertions, Actions, Innervations

Scalenes Anatomy Study Scalene Muscle Group: Synergist: Sternocleidomastoid, Longus colli and capitis Antagonist: Semispinalis capitis and cervicis, Splenius capitis and cervicis, Spinalis cervicis, Interspinales, Longissimus cervicis, Iliocostalis cervicis, Multifidus. Scalenus Anterior Origin: Anterior tubercles of the  transverse processes of (C3-C6) Insertion: Scalene tubercle and cranial crest of first rib Action: Flexion of the cervical spine,…

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Temporalis Anatomy: Origin, Insertion, Action, Innervation

Temporalis Anatomy Study Origin: Temporal fossa and temporal fascia. The fibers blend together to pass between the zygomatic arch and the side of the skull. Insertion: The upper anterior border and inner surface of the coronoid process and the ramus of the mandible Action: elevates the mandible, retracts the mandible Innervation: Branches of the mandibular…

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Suboccipital Anatomy: Rectus Capitis Posterior Major and Minor, Obliquus Capitis Superior and Inferior

Suboccipital Anatomy Study: Origin, Insertion, Action and Innervation Rectus Capitis Posterior Major Origin: Spinous process of axis (C2) Insertion: Lateral half of the inferior nuchal line of the occipital bone Action: Extension of the head Innervation: Posterior Primary Ramus of C1 Blood Supply: Branches from the vertebral artery Primary Actions of the Rectus Capitis Posterior…

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Occipitalis Anatomy: Origin, Insertion, Action, Innervation

Occipitalis Anatomy Study Origin: The lateral portion of the superior nuchal line of the occipital bone Insertion: Galea aponeurotica Action: Pulls the scalp posteriorly Innervation: Posterior auricular branch of the facial nerve (cranial nerve VII) Blood Supply: Branches from the occipital artery Primary Actions: 1. Pulls the scalp posteriorly For pain and symptom information see:…

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Masseter Anatomy: Origin, Insertion, Action, Innervation

Masseter Anatomy Study: Origin, Insertion, Action and Innervation Origin: Superficial portion: from the maxillary process of the zygomatic bone, and the anterior two-thirds of the inferior border of the zygomatic arch Deep portion: from the deep and medial surface of the zygomatic arch Insertion: Superficial portion: the angle and ramus of the mandible Deep portion:…

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Frontalis Anatomy: Origin, Insertion, Action, Innervation

Frontalis Anatomy Origin: Galea Aponeurotica Insertion: By right and left bellies from the skin of the eyebrow, with fibers extending down to interdigitate with orbicularis oculi and procerus Action: Wrinkles the skin of the forehead Innervation: Temporal branch of the facial nerve (cranial nerve VII) Blood Supply:  Supraorbital branch from the ophthalmic artery. Primary Actions:…

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Sternocleidomastoid Anatomy: Origin, Insertion, Action, Innervation

Sternocleidomastoid Anatomy Study Sternal Head: Origin:  Upper part of the anterior surface of the manubrium Clavicular Head: Origin: Superior surface of the medial one third of clavicle Insertion: Lateral surface of the mastoid process of the occipital bone, from its apex to its superior border, and by a thin aponeurosis to the lateral half of…

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