关键词: 长爪沙鼠, 子午沙鼠, 大沙鼠, 甘肃绒鼠, 黑腹绒鼠, 阴茎头, 组织学 , 扫描电镜

Abstract: In this paper,through successive sections of glans penis in different age groups of the Meriones unguiculatus,we observed the various bony and soft structures of the glans under dissecting microscope,such as，outer crater．inner crater．urethral lappet，proximal bacula process，distal baeular process,lateral bacular process,blood sinus and epidermal spines,meanwhile,their origin and relationship were discussed .We considered that the proximal bacular process and outer crater were the derivatives of corpus
cavernosum penis，and the inner crater, urethral lappet,distal bacular process and lateral bacular process wereall the deri vatives of corpus cavernosum urethra. The epidermal spines of the glans might havetactile function and increasing the stimulation during copulation.
Through the observation of the epidermal spines of glans penis in five species, i．e Merones unguiclatus,M.meridianus，Rhomtmmys opimus．Eothenomys eva and E .melanogaster under scanning electron microscope, it revealed that there are distinct intergeneric and interspecific diferences, so we considered the physical characters and measurements of the epidermal spine may havesome taxonomic significartce．

Key words: meriones unguiculatus, M.merdianus, Rhombomys opimus, Eothenomys eva, E.melanogaster, Glans penis, histology, Scanning electron microscope