AI Face Scalp Fossa

Anatomical layers of the scalp defined by an acronym SCALP

Skin, dense Connective tissue, Aponeurosis (epicranial), Loose connective tissue, and Pericranium

Muscle that elevates the eyebrows, wrinkles forehead skin, and protracts the scalp to express surprise or curiosity

Occipitofrontalis (Frontal Belly)

Muscle that retracts the scalp, enhancing the action of the frontal belly

Occipitofrontalis (Occipital Belly)

Orbital sphincter muscle whose palpebral part gently closes eyelids during blinking and orbital part tightly closes eyelids during winking

Orbicularis Oculi

Oral sphincter muscle whose intrinsic tonus closes the mouth and phasic contraction compresses and protrudes the lips or resists distension during blowing

Orbicularis Oris

Muscle that presses the cheek against molar teeth during mastication to maintain food between occlusal surfaces

Buccinator

Muscle that depresses the mandible against resistance and tenses the skin of the inferior face and neck to convey stress or tension

Platysma

Cranial nerve providing motor innervation to all muscles of facial expression via temporal, zygomatic, buccal, marginal mandibular, cervical, and posterior auricular branches

Facial Nerve (CN VII)

Trigeminal division providing sensory innervation to the bridge and dorsum of the nose, superior eyelid, forehead, and anterior two-thirds of the scalp

Ophthalmic Division (CN V1)

Trigeminal division providing sensory innervation to the lateral nose, inferior eyelid, superior cheek, superior lip, and anterior temporal region

Maxillary Division (CN V2)

Trigeminal division providing sensory innervation to the inferior lip, chin, inferior cheek, posterior temporal region, and tragus of the auricle

Mandibular Division (CN V3)

Spinal nerves supplying sensory innervation to skin over the parotid region, angle of the mandible, auricle lobe, and scalp posterior to the auricle

Great Auricular (C2, C3) and Lesser Occipital (C2) Nerves

Spinal nerves supplying sensory innervation to the posterior third of the scalp and inferior occipital region

Greater Occipital (C2) and Third Occipital (C3) Nerves

Primary arterial supply to the face and scalp arising via facial, occipital, posterior auricular, maxillary, and superficial temporal branches

External Carotid Artery

Internal carotid branches arising from the ophthalmic artery that supply the forehead and anterior scalp

Supra-orbital and Supratrochlear Arteries

Primary vein of the face that drains directly into the internal jugular vein

Facial Vein

Venous structures of the head and neck that drain into the external jugular vein

Superficial Temporal, Maxillary, Posterior Auricular, and Retromandibular Veins

Lymphatic drainage pathway for the face and scalp before emptying into deep cervical nodes along the internal jugular vein

Superficial Ring of Nodes at Head-Neck Junction

Irregularly shaped space deep and inferior to the zygomatic arch that communicates with the pterygopalatine fossa via the pterygomaxillary fissure

Infratemporal Fossa

Masticatory and temporal muscles housed within the infratemporal fossa

Inferior Temporalis, Lateral Pterygoid, and Medial Pterygoid Muscles

Vascular contents housed within the infratemporal fossa

First and Second Parts of Maxillary Artery, Maxillary Vein, and Pterygoid Venous Plexus

Neural structures located within the infratemporal fossa

Mandibular Nerve (CN V3) and Branches, Otic Ganglion, and Chorda Tympani (CN VII)

Aperture communicating the infratemporal fossa with the pterygopalatine fossa

Pterygomaxillary Fissure

Openings connecting the pterygopalatine fossa to the middle cranial fossa

Foramen Rotundum and Pterygoid Canal

Opening connecting the pterygopalatine fossa to the nasal cavity

Sphenopalatine Foramen

Opening connecting the pterygopalatine fossa to the orbit

Inferior Orbital Fissure

Canals connecting the pterygopalatine fossa to the oral cavity and palate

Greater and Lesser Palatine Canals

Canal connecting the pterygopalatine fossa to the pharyngeal vault

Pharyngeal Canal

Terminal branches of the third part of the maxillary artery located within the pterygopalatine fossa

Posterior Superior Alveolar, Infra-orbital, Sphenopalatine, Descending Palatine, Artery of Pterygoid Canal, and Pharyngeal Arteries

Neural and autonomic structures located within the pterygopalatine fossa

Maxillary Nerve (CN V2), Pterygopalatine Ganglion, and Nerve of Pterygoid Canal

Autonomic pathway where preganglionics from the greater petrosal nerve (CN VII) enter via the pterygoid canal to synapse in the pterygopalatine ganglion to supply lacrimal and mucosal glands

Parasympathetic Secretomotor Pathway of PPF

Cranial nerve branch providing motor innervation to all four primary muscles of mastication

Mandibular Nerve (CN V3)

Muscle originating from the infratemporal crest and lateral pterygoid plate that protrudes the mandible bilaterally and produces side-to-side grinding movements unilaterally

Lateral Pterygoid

Muscle originating from the lateral pterygoid plate, palatine bone, and maxilla tuberosity that elevates and protrudes the mandible bilaterally and produces side-to-side grinding movements unilaterally

Medial Pterygoid

Muscle originating from the zygomatic arch and inserting into the mandibular ramus and angle that elevates and protrudes the mandible

Masseter

Muscle originating from the temporal fossa that elevates the mandible and whose posterior fibers retract the mandible

Temporalis

Layer of the scalp known as the "danger zone" where blood and infections accumulate and spread easily

Loose Connective Tissue Layer

Clinical manifestation where fluid or blood in the loose connective tissue layer tracks anteriorly into the eyelids due to lack of frontal bony attachments

Periorbital Hematoma (Black Eye)

Valveless venous structures that allow scalp infections in the loose connective tissue layer to track retrogradely into the cranial cavity

Emissary Veins

Valveless network connecting superficial facial veins to the cavernous sinus, serving as a conduit for severe infections

Pterygoid Venous Plexus

Life-threatening condition resulting from spread of superficial facial infections through the pterygoid venous plexus, carrying a mortality rate up to 20%

Cavernous Sinus Thrombosis

Severe disorder presenting with sudden attacks of lancinating facial pain, most commonly affecting V2 and V3 distributions due to neurovascular compression

Trigeminal Neuralgia

Surgical procedure providing the most effective and permanent treatment for trigeminal neuralgia

Microvascular Decompression

Anatomical structure enclosing the parotid gland that limits enlargement during inflammation, causing severe pain during chewing

Unyielding Parotid Sheath

Nerve plexus running directly inside the substance of the parotid gland, creating surgical vulnerability during parotidectomy

Facial Nerve (CN VII) Plexus

Secretomotor path involving preganglionics via the lesser petrosal nerve (CN IX), synapse in the otic ganglion, and postganglionics riding on the auriculotemporal nerve (CN V3)

Parasympathetic Pathway to Parotid Gland

Joint displacement occurring when excessive contraction of lateral pterygoid muscles or a sideways blow forces the mandibular head anteriorly past the articular tubercle

Temporomandibular Joint (TMJ) Dislocation

Nerves at risk of iatrogenic or traumatic injury following anterior dislocation of the temporomandibular joint

Auriculotemporal Nerve and Facial Nerve Branches

Lesion disrupting preganglionic parasympathetics heading to the pterygopalatine ganglion, causing ipsilateral dry eye and dry nasal mucosa

Greater Petrosal Nerve Lesion

Pathology where maxillary sinus inflammation compresses CN V2 along the sinus roof, producing numbness over the lower eyelid, lateral nose, cheek, upper lip, and upper teeth/gums

Infra-orbital Nerve Compression