vertebrate morphology

lolita-and-the-sun  asked:

That stained chameleon - how is that done? It's highlighting the bones, but what's supposed to be the clear part? I'm curious (:

So it’s a skinned chameleon and then the body was placed in a digestive enzyme, trypsin, to make it color less and clear throughout and then the body was placed in a dye that attaches too free Ca+2 (calcium ions) in the body. This is common in vertebrate morphology labs

Genetically and morphologically the coelacanth has more in common with four-limbed vertebrates than almost any other fish, and its smaller genome is ideal for study. This makes the coelacanth a powerful link between aquatic and land vertebrates - a living record of their transition from water to land millions of years ago.

From the TED-Ed Lesson The coelacanth: A living fossil of a fish - Erin Eastwood

Animation by James Price

Quick List of Specialized Structures in Vertebrate Integument
  1. Basket Cells: mechanoreceptor cells at the base of hair follicles 
  2. Keratinocytes: the majority of cells comprising the epidermis; dead, cornified layer that protects the underlying integumentary layers
  3. Stratified Squamous Epithelium: keratinized squamous epithelium is the tissue that comprises the skin; non-keritatinized epithelium lines the cornea, oral cavity, etc.
  4. Langerhans cells: dendritic cells that are morphologically and functionally similar to macrophages
  5. Chromatophores: Produce pigment in the integument (known as chromatocytes, specifically melanin, in mammals and birds) 
  6. Merkel Cells:  receptor cells found in the skin of vertebrates that have synaptic contacts with somatosensory afferents. They are associated with the sense of light touch discrimination of shapes and textures.
  7. Pacinian Corpuscles:  nerve receptors located in the subcutaneous fatty tissue that respond to pressure/ vibration.
  8. Sudoriferous Glands: the sweat glands
  9. Stratum Corneum: tough, outermost layer of the epidermis; protects underlying cell layers