Anatomical diagrams of the human skull illustrating terminal branches of the trigeminal nerve and associated facial structures. Figure (a) is an anterior view highlighting the supraorbital notch (1), infraorbital foramen (2), and mental foramen (3), with accompanying neurovascular bundles shown in yellow (nerves) and blue/red (vessels). The diagram also depicts the overlying musculature: the corrugator supercilii (4), levator labii superioris (5), and depressor labii inferioris (6). Figure (b) provides a lateral view demonstrating the course of the auriculotemporal nerve (7) emerging from the parotid gland (P) and ascending across the temporal region. The temporalis muscle (8) is shown in pink, providing anatomical context for nerve distribution. This educational illustration demonstrates the relationship between bony landmarks, superficial facial muscles, and the sensory nerve exits essential for clinical procedures such as regional nerve blocks and the management of trigeminal neuralgias.

This clinical photograph displays a cadaveric dissection of the left extratemporal facial nerve (Cranial Nerve VII), highlighting its complex branching pattern and vascular relationships. The main trunk bifurcates into the temporofacial and cervicofacial divisions. The superior temporofacial division gives rise to the temporal and zygomatic branches, which course toward the upper face, and a buccal branch. The inferior cervicofacial division exhibits a rare anatomical variation where it bifurcates around the posterior facial vein; the upper branch passes superficially while the lower branch courses deep to the vein. Key anatomical landmarks include the retromandibular vein, the external jugular vein (EJV), and the masseter muscle. Labeled structures include the temporal (4), zygomatic (5), buccal (6), and marginal mandibular (8, 9) branches. This image is an essential educational resource for surgical anatomy, particularly for parotidectomy and maxillofacial procedures, demonstrating the critical proximity of neural branches to venous structures in the parotid region.

Anatomical diagram and 3D visualization illustrating a rare neurovascular anatomical variation in the maxillofacial region. This lateral view focuses on the right side of the mandible and cervical area, highlighting the spatial relationship between the marginal mandibular nerve (MMN), the facial artery, and the facial vein. The MMN is depicted as a blue tubular structure descending toward the lower border of the mandible. Crucially, the diagram demonstrates an atypical course where the MMN runs deep (medial) to the facial artery and vein (rendered in red), contrasting with the standard anatomical presentation where the nerve typically crosses superficial to these vessels. The visualization overlays these structures on a skeletal model of the skull and mandible, showing the nerve's proximity to the mandibular angle and body. This educational content is relevant for surgical anatomy, particularly in the context of neck dissections, submandibular gland excision, and rhytidectomy, where preserving the MMN is critical to prevent paralysis of the depressor muscles of the lower lip.

This anatomical diagram utilizes a lateral view of a human skull model to illustrate the surgical vulnerability of the temporal branch of the facial nerve. A red hatched triangular region is overlaid on the temporal fossa, bounded by the zygomatic arch inferiorly, the zygomatic process of the frontal bone anteriorly, and extending toward the superior temporal line. This area represents the danger zone where the temporal branch of the facial nerve is most superficial. A black star is marked within the superior-anterior portion of this shaded region, indicating the specific placement of a Mayfield head clamp pin that resulted in postoperative frontalis muscle palsy. The image serves as a clinical education tool for neurosurgical and orthopedic surgical positioning, highlighting the risk of iatrogenic nerve injury from external fixation devices when applied near the course of the facial nerve branches.

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.

Diagnostic neuroimaging featuring two T1-weighted post-contrast MRI views focusing on the internal auditory canal and facial nerve (Cranial Nerve VII). Panel A (Axial view) demonstrates abnormal focal enhancement of the left facial nerve at the level of the geniculate ganglion, indicated by a yellow arrow, visible against the surrounding temporal bone and cerebellum. Panel B (Coronal view) shows linear enhancement and asymmetric enlargement of the descending mastoid segment of the left facial nerve, extending from the geniculate ganglion toward the stylomastoid foramen, also marked by a yellow arrow. Comparison with the contralateral right side reveals significant hyperintensity and thickening on the left. These findings are clinically significant in the diagnostic workup of facial nerve pathology, such as Bell's palsy or facial nerve schwannoma. General neuroanatomical structures including the lateral ventricles, temporal lobes, and brainstem are also visible.

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.