A nose that looks like a hand and acts like an eye: the unusual mechanosensory system of the star-nosed mole.
Level 5 - mechanism / opinion, no new human data
Narrative review of animal neuroanatomy and comparative physiology.
PubMed 10555270 · doi:10.1007/s003590050396
What was done
Review of behavioral, peripheral anatomical, and neurophysiological evidence regarding the specialized nasal appendages of the star-nosed mole (Condylura cristata). The paper synthesizes findings on the distribution of mechanoreceptive Eimer's organs, peripheral innervation patterns, and the organization of the primary somatosensory cortex relative to tactile behavior.
What was found
The abstract reports no specific statistical metrics or numerical values beyond describing 22 fleshy appendages covered in thousands of mechanoreceptive Eimer's organs. Behaviorally, the mole employs a central tactile area analogous to an optical fovea for fine object exploration. This tactile fovea exhibits denser peripheral innervation and an enlarged somatosensory cortical representation that aligns closely with behavioral usage patterns rather than strictly with peripheral innervation density.
Why it matters
The findings illustrate convergent organizational principles between high-acuity tactile systems and visual systems in mammals, highlighting how neural maps adapt to specialized behavioral demands.
Limits
The abstract provides no quantitative data, sample sizes, or systematic search criteria. The observations are derived from a highly specialized non-human mammal (Condylura cristata), limiting the direct generalizability of these anatomical specializations to other mammalian sensory systems.
Cited by
- supports The star-nosed mole possesses a specialized nose with 22 fleshy appendages used to navigate tunnels via touch.