Month: September 2022

“THE MODIOLUS is composed of dense compact fibromuscular tissue. It is first and foremost a mobile decussation between the muscles ending in it and the orbicularis oris muscle.” https://lnkd.in/dSmsCKn View in LinkedIn

FACE EVOLUTION. “Evolution of the human face can be conceptualized as proceeding through structurally and functionally integrated units based on these demands but evolution of the human face as a whole would have been constrained by the mosaic nature of evolution of the soft tissue “mask,” underlying viscerocranium, dentition, and brain.” https://lnkd.in/di-WAXE View in LinkedIn

FACIAL MASK. “The evolution of mammals included development of a mobile face or “facial mask.” In most orders it is used, at least in part, for visual communication via facial displays. In addition, evolution of the facial mask is associated with reorganization of the visual, olfactory, and auditory regions of the brain.” https://lnkd.in/di-WAXE View in LinkedIn

SECONDARY FUNCTION. “Facial displays (or expressions) are created by contraction of the mimetic muscles, branchiomeric skeletal muscle that attach into the dermis of the face and into the cartilages of the external ear and external nose. These muscles are innervated by the facial nerve and primarily function to change the size of the openings for the orbital, nasal, and oral cavities to assist their biologic functions, produce movement of vibrissae, and assist in nutrient intake.” https://lnkd.in/di-WAXE View in LinkedIn

ADDITIONAL FUNCTIONS. “At higher levels of evolution the muscles are adapted for communication as articulators in vocalization and producing the movements used in visual communication of facial displays.” https://lnkd.in/di-WAXE View in LinkedIn

SO ENDS this contemplation of what gives the human mouth and smile such a range of subtle expressions, and how these are lacking in other vertebrates, and how they arose during evolution. The exquisite anatomical analysis that has gone into this work is used daily in cosmetic surgery, and takes the crusty old Victorian anatomists working in the museum basement right into the modern clinic. Lovely stuff. View in LinkedIn

SO ENDS this contemplation of what gives the human mouth and smile such a range of subtle expressions, and how these are lacking in other vertebrates, and how they arose during evolution. View in LinkedIn

The exquisite anatomical analysis that has gone into this work is used daily in cosmetic surgery, and takes the crusty old Victorian anatomists working in the museum basement right into the modern clinic. Lovely stuff View in LinkedIn

OLD MONO-LINEAR VIEWPOINT. “Essentially, every prokaryote is its own lineage, either dying, budding off, or splitting into daughter cells that are clones of the parent, in the process of asexual reproduction. … Daughter cells are clones, with the same DNA as the parent cell, so they are already well adapted to the microenvironment.” https://standardsingenomics.biomedcentral.com/articles/10.1186/s40793-016-0180-8 View in LinkedIn

NEW VIEWPOINT. “This multi-cellular eukaryotes-centric viewpoint errs in completely omitting the role of horizontal gene transfer —acquisition genetics—in generating vast genetic variation among prokaryotes—much more than transmission genetics does in multi-cellular eukaryotes.” https://standardsingenomics.biomedcentral.com/articles/10.1186/s40793-016-0180-8 View in LinkedIn