This anatomical diagram presents an anterior view of a human skull overlaid with schematic arrows illustrating facial lymphatic drainage pathways. The illustration focuses on the primary drainage routes from two specific injection sites on the left side of the face (viewer's right). The supra-ocular pathway is shown as a superiorly arching arrow originating above the orbit and directing toward the pre-auricular lymph nodes. The para-nasal pathway originates near the nasal bridge and divides into three distinct directions: inferiorly toward the sub-mandibular lymph nodes, laterally toward the parotid lymph nodes, and superior-laterally toward the pre-auricular lymph nodes. This diagram is utilized in nuclear medicine and clinical anatomy to demonstrate typical patterns of lymphoscintigraphy tracer movement and to highlight the anatomical landmarks (orbit, nasal cavity, mandible) used to map lymphatic flow in patients with facial edema or lymphedema.

Anatomical diagram of the brain in a sagittal view illustrating the pathway of the trigeminal nerve (CN V). The illustration highlights key anatomical segments and landmarks relevant to neuroanatomy and clinical neurology. Centrally, the trigeminal nerve is traced from its distal branches—V1 (ophthalmic), V2 (maxillary), and V3 (mandibular)—as they exit via the superior orbital fissure, foramen rotundum, and foramen ovale, respectively. Moving proximally, the diagram identifies the cavernous segment (highlighted by a blue oval), the trigeminal ganglion situated within Meckel's cave, and the cisternal portion of the nerve. The nerve is shown entering the brainstem to reach the trigeminal nerve nucleus in the pons. Superior to the nucleus, a green dot marks the locus ceruleus. The diagram provides a clear educational visualization of the transition from peripheral branches to central nuclei, facilitating the study of cranial nerve distribution and relevant neurosurgical corridors.

Anatomical diagram of a lateral view of the human skull, specifically focusing on the deep facial nerves and related osteological landmarks. The illustration highlights the trigeminal nerve (CN V) divisions using yellow color-coding. The maxillary nerve (V2) is shown exiting the cranial cavity through the foramen rotundum to enter the pterygopalatine fossa, located anterior to the lateral pterygoid plate. The mandibular nerve (V3) is depicted exiting via the foramen ovale, descending posterior to the lateral pterygoid plate. Key labels include the Pterygopalatine fossa, Maxillary nerve, Foramen ovale, Mandibular nerve, and Lateral pterygoid plate. The diagram serves as an educational resource for understanding the regional anatomy required for performing nerve blocks and identifying neural pathways within the infratemporal and pterygopalatine regions.

This endoscopic clinical photograph provides a high-magnification view of a surgical dissection of the human left temporal bone, specifically focusing on the facial nerve anatomy. The image demonstrates the labyrinthine segment (Ls) of the facial nerve following the removal of overlying bone. Key anatomical landmarks are labeled: the tympanic segment (Ts) of the facial nerve, the incus, and the middle fossa dura (MFD). The vertical crest (Bill's bar), located at the fundus of the internal acoustic canal, is marked with an 'X'. Additionally, the ampullary ends of the lateral semicircular canal (indicated by an arrow) and the superior semicircular canal (indicated by a star) are visible. The membranous labyrinths have been removed to facilitate clear visualization of these bony boundaries. This view is clinically significant for understanding surgical approaches for facial nerve decompression, particularly at the meatal foramen and the junction of the labyrinthine and tympanic segments.

A clinical intraoperative photograph showing the anatomical arrangement of the facial nerve branches in a surgical dissection, following parotidectomy. The image provides a lateral view of the cervicofacial region where the parotid gland has been removed to expose the extratemporal facial nerve plexus. Labeled branches include the temporal branch extending superiorly, the zygomatic and buccal branches traveling toward the mid-face, and the marginal mandibular and cervical branches descending inferiorly. The cervical branch is depicted in close proximity to the jugular vein, which is visible in the lower surgical field. Surgical instruments (retractors) are positioned to maintain exposure of the deep tissues. A 5mm grid scale is included for anatomical measurement. This visual serves as an educational guide for surgical anatomy, identifying key landmarks for nerve preservation during parotid gland surgery or facial nerve decompression.

This intraoperative clinical photograph displays an anatomical dissection of the facial nerve (Cranial Nerve VII) within the parotid region. The image illustrates a 'Type II' branching pattern characterized by a single facial nerve trunk (FNT) that divides directly into multiple terminal branches. Notably, this variant lacks the typical primary bifurcation into temporofacial and cervicofacial divisions. The nerve branches appear as thin, pale, string-like structures radiating through the reddish, fleshy tissue of the surgical field. The surrounding area shows exposed glandular and soft tissue relevant to a parotidectomy procedure. This visual serves as an educational reference for surgical anatomy, highlighting normal anatomical variations of the extracranial facial nerve that are critical for surgeons to identify during parotid gland surgery to avoid nerve injury and post-operative facial paralysis.

This clinical photograph displays a gross anatomical dissection of the right facial nerve (Cranial Nerve VII) within the parotid region. The image demonstrates a single facial nerve trunk that undergoes bifurcation into primary upper and lower divisions. Following this initial split, the nerve exhibits a complex, interconnected branching pattern identified as Davis Type IV. Multiple secondary branches are visible radiating across a bed of yellowish adipose tissue and the masseter muscle fascia. These branches eventually form the terminal ramifications: temporal (T), zygomatic (Z), buccal (B), marginal mandibular (M), and cervical (C) branches. The parotid gland tissue has been partially reflected to expose the pes anserinus. This specimen serves as an educational example of neuroanatomical variation, specifically highlighting the Davis classification system for surgical planning in parotidectomy and facial reconstructive procedures.

This clinical photograph displays a patient with bilateral lower motor neuron (LMN) facial nerve palsy, likely associated with Ramsay Hunt syndrome or a similar polyneuropathy. The upper panel illustrates bilateral lagophthalmos and Bell's phenomenon: when the patient attempts to close his eyes, the globes roll upward, leaving the sclera visible due to incomplete eyelid closure. The lower panel demonstrates significant facial muscle weakness and hypotonia, characterized by bilateral drooping of the oral commissures and a slack, open-mouthed appearance with visible teeth. There is a notable absence of nasolabial folds and forehead wrinkling, consistent with a complete bilateral facial nerve deficit. The educational focus is on identifying the physical signs of LMN facial paralysis, specifically the loss of motor control in the orbicularis oculi and orbicularis oris muscles, which differentiates it from upper motor neuron lesions.

Clinical photograph of a patient's face demonstrating bilateral lower motor neuron facial nerve palsy (CN VII). The image highlights lagophthalmos, where both eyelids are only partially closed despite an attempt at full closure. A positive Bell's phenomenon (Bell's sign) is clearly visible bilaterally, characterized by the upward and outward rotation of the globes, exposing the white sclera beneath the incompletely closed eyelids. The mid-to-lower face shows relative symmetry at rest with neutral oral commissures, suggesting the deficit primarily impacts upper facial musculature or is uniformly bilateral. This visual is typical for clinical presentations of bilateral facial paralysis, which can be seen in systemic neurological conditions such as Guillain-Barré syndrome (specifically the Miller Fisher variant or facial diplegia subtype). The photograph serves as an educational resource for identifying cranial nerve pathology and distinguishing between upper and lower motor neuron signs.

This clinical photograph shows the frontal view of an elderly male patient exhibiting signs of bilateral lower motor neuron facial nerve palsy (Bell's palsy). A prominent finding is Bell's phenomenon, where the patient's eyeballs rotate upward and outward when attempting to close the eyes, leaving the sclera visible due to incomplete eyelid closure (lagophthalmos). The facial features appear relatively symmetrical but mask-like, with a loss of normal expression lines. The mouth is slightly open with evidence of drooling at the commissures, consistent with orbicularis oris muscle weakness. This presentation is highly suggestive of cranial nerve VII involvement, often associated with systemic conditions such as Guillain-Barr syndrome, sarcoidosis, or leptomeningeal metastasis. The image is an educational resource for demonstrating neurological deficits and the physical examination findings of bilateral facial paralysis.

This clinical photograph shows a close-up of the right external ear and preauricular region exhibiting characteristic features of Ramsay Hunt syndrome (herpes zoster oticus). The image displays a cluster of small, fluid-filled vesicles on an erythematous base. These herpetic lesions are localized to the pinna and the external auditory canal entrance, which corresponds to the sensory distribution of the facial nerve (cranial nerve VII). Some vesicles appear intact with clear fluid, while others show signs of early crusting or rupture. The surrounding skin exhibits diffuse erythema and mild edema. This presentation is medically significant for medical students and clinicians as it illustrates the typical cutaneous manifestations of varicella-zoster virus reactivation involving the geniculate ganglion. Key educational points include the recognition of dermatomal vesicular rashes and their association with otalgia and potential facial nerve palsy.

This composite clinical photograph displays the hallmark signs of Ramsay Hunt syndrome (herpes zoster oticus). Image A (left) shows the right ear auricle with inflammatory swelling and a characteristic vesicular eruption within the concha and external auditory meatus. Multiple clustered vesicles and hemorrhagic crusting are visible, extending down the preauricular area and neck. Image B (right) demonstrates an associated ipsilateral peripheral facial nerve palsy (CN VII). Key findings include significant facial asymmetry with right-sided drooping, loss of nasolabial fold depth, and deviation of the mouth to the contralateral (left) side. The patient displays Bell's phenomenon on the right, where the globe rotates upward during an attempt to close the eye, leaving only the white sclera visible due to incomplete eyelid closure (lagophthalmos). These images illustrate the triad of otalgia, auricular vesicles, and facial paralysis typical of varicella-zoster virus reactivation in the geniculate ganglion, targeting medical students and clinicians in neurology, otolaryngology, and dermatology.

Two-panel clinical photograph illustrating the classic presentation of Ramsay Hunt syndrome (herpes zoster oticus). The left panel displays a frontal view of a patient's face exhibiting signs of peripheral facial nerve (CN VII) palsy. Notable features include ipsilateral facial drooping, flattening of the nasolabial fold, and a downward turn of the mouth corner on the affected side. The right panel provides a close-up of the auricular region, showing a characteristic zoster rash. Multiple erythematous vesicles and areas of crusting are visible within the concha and on the antihelix of the pinna. The image demonstrates the diagnostic association between acute facial paralysis and a painful vesicular eruption in the ear canal or auricle, highlighting the reactivation of the varicella-zoster virus in the geniculate ganglion. This material is suitable for medical education focusing on neurology, dermatology, and infectious diseases.

High-resolution axial computed tomography (CT) images of the left temporal bone, presented in three sections (A, B, and C) to demonstrate the course of the facial nerve (Fallopian) canal. Red arrows highlight different segments of the canal. Image A shows the labyrinthine segment, appearing as a narrow radiolucent channel within the dense petrous bone, traveling anterolaterally towards the geniculate ganglion. Image B depicts the tympanic (horizontal) segment, visualized as a thin lucency running along the medial wall of the tympanic cavity, inferior to the lateral semicircular canal. Image C illustrates the mastoid (descending) segment, where the canal assumes a vertical orientation within the mastoid portion of the temporal bone, posterior to the external auditory canal. These images are clinically relevant for evaluating anatomical variations or pathologies, such as Bell's palsy, by assessing the diameter and integrity of the bony canal across its various intratemporal segments.

Educational medical graphic combining anatomical dissections (a-e) and diagnostic imaging (f) focused on the segments of the facial nerve (CN VII). Panels (a-b) illustrate the cisternal segment within the cerebellopontine angle and internal acoustic meatus (IAM) via a retrosigmoid approach. Panel (c) shows a superior view of the petrous bone exposing meatal, labyrinthine, and tympanic segments relative to the cochlea and semicircular canals. Panel (d) displays a middle fossa view highlighting the greater superficial petrosal nerve (GSPN) and Gasserian ganglion. Panel (e) depicts the mastoid segment after mastoidectomy. Panel (f) presents a series of axial T2-weighted MRI slices. On the left (normal side), yellow circles track the facial nerve through its cisternal, meatal, labyrinthine, geniculate, tympanic, and mastoid segments. On the contralateral right side, a large, heterogeneous, hyperintense facial nerve schwannoma is visible, causing significant expansion of the IAM and displacement of the surrounding brainstem and cerebellar structures. The content serves to teach the complex three-dimensional course of CN VII and its pathological appearance in schwannomatosis.

Two intraoperative endoscopic photographs (A and B) demonstrate a complete surgical decompression of the left facial nerve in a cadaveric specimen, tracing the nerve from the labyrinthine meatus to the stylomastoid foramen. Image B shows the proximal segments, including the meatal foramen (a), labyrinthine portion (b), greater superficial petrosal nerve (c), the first genu (d), the geniculate ganglion (e), and the proximal horizontal (tympanic) segment (f). Image A details the distal course, illustrating the continuation of the horizontal segment (h) as it passes the sinus tympani (g), reaching the second genu (i). From this point, the nerve transitions into its vertical (mastoid) segment (j), extending toward the stylomastoid foramen. This anatomical display highlights the relationship between the facial nerve and middle ear landmarks, such as the sinus tympani, and is relevant for otologic surgery, temporal bone fracture management, and facial nerve decompression procedures.