1 doctor weighed in:
Do humans have some remains of a nictitating membrane?
1 doctor weighed in

Dr. Alfred H. Rivera
Ophthalmology
In brief: No.
Fully developed nictitating membranes are found in birds, reptiles, amphibians, fish, and mammals, but are rare in primates.
In humans, the plica semilunaris (also known as the semilunar fold) and its associated muscles are thought to be probably homologous to the nictitating membranes seen in some other mammals and other vertebrates. In most primate species, a plica semilunaris is present.

In brief: No.
Fully developed nictitating membranes are found in birds, reptiles, amphibians, fish, and mammals, but are rare in primates.
In humans, the plica semilunaris (also known as the semilunar fold) and its associated muscles are thought to be probably homologous to the nictitating membranes seen in some other mammals and other vertebrates. In most primate species, a plica semilunaris is present.
Dr. Alfred H. Rivera
Dr. Alfred H. Rivera
Thank
Read more answers from doctors