absent, if present generally as fine hairs (Fig.
The ringwulst has a unique shape and is situated within the ring sinus (34) such that movements of the vibrissae
are likely to produce corresponding movements of the ringwulst.
Long stiff whiskers, called vibrissae
, are used for sensing prey in the mud or finding the underwater opening to a burrow in murky water.
An experienced investigator recorded freezing time--defined as complete immobility of the animal, with the absence of vibrissae
movements and sniffing--in minute bins continuously for 5 min with a chronometer.
, or whiskers, located on the sides of the muzzle and beneath the chin, are so sensitive that they can detect airflow.
Chaetotaxy: ocellar setae 2 pair parallel and proclinate; postocellar setae 1 pair parallel; outer vertical setae 1 pair parallel; inner vertical setae 1 pair crossed; para-vertical 1 pair convergent; post-ocular seta black homogeneously distributed up to the gena; inter-frontal and orbital proclinate absent; facial carina slightly prominent with few short black setulae at base, above vibrissae
crossed; subvibrissae approximately 1/2 length of vibrissae
The paragraph on sensory organs is very interesting, particularly the section about vibrissae
The eyes and vibrissae
in Dapson's specimen were normal color.
A successful crush was confirmed in each animal by observing complete loss of the blink reflex, flattening of vibrissae
orientation, and paralysis of vibrissae
were even sensitive enough to detect the size and shape of different mock prey.
The resultant seizures were scored as follows: Stage 0 (no response); Stage 1 (hyperactivity, restlessness and vibrissae
twitching); Stage 2 (head nodding, head clonus and myoclonic jerks); Stage 3 (unilateral or bilateral limb clonus); Stage 4 (forelimb clonic seizures); Stage 5 (generalized clonic seizures with falling).
seemed normally developed but not long--the longest vibrissae
were about the length of the head.
Neotoma are thought to have a highly-developed tactile sense as a result of prominent vibrissae
(Rhoads, 1903; Poole, 1940; Rainey, 1956; Wiley, 1980).
are sensitive to prey movements and can be used to track prey from hundreds of meters away (Dehnhardt et al.
The hairs in our nose, called vibrissae
, filter the air we breathe.