- May 6, 2026The inferior tarsal muscle is the lower eyelid homologue of Mueller's superior tarsal muscle, both receiving sympathetic innervation. Its loss…
- May 6, 2026The corrugator supercilii produces the characteristic vertical glabellar lines between the eyebrows during frowning or concentration. It inserts directly into…
- May 6, 2026Auricularis anterior is the most vestigial of the three auricular muscles. In most humans it is non-functional, but it retains…
- May 6, 2026Auricularis posterior is the most reliably present auricular muscle. Its posterior auricular nerve supply is the first branch of the…
- May 6, 2026Auricularis superior is the largest auricular muscle though still functionally vestigial in humans. Some individuals can voluntarily elevate the ear…
- May 6, 2026The incisivii labii superioris (upper) is one of the smaller perioral muscles contributing to lip shaping during speech and expression.…
- May 6, 2026The incisivii labii inferioris (lower) is the mandibular counterpart to the superior version, connecting the lower alveolus to the modiolus.…
- May 6, 2026The risorius is a variable muscle — it may be absent, single, or multiple on each side. Its lateral pull…
- May 6, 2026Compressor naris is the transverse part of nasalis, compressing the cartilaginous nose. It acts with dilator naris in a coordinated…
- May 6, 2026Dilator naris is the alar part of nasalis, flaring the nostril during inspiration to reduce nasal airway resistance. It is…