



版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
1、13 2010-12-251.15 THE OCULAR ADNEXA 1.15.1 Eyebrows The eyebrows are folds of thickened skin covered with hair. The skin fold is supported by underlying muscle fibers. The glabellalbel眉间 is the hairless prominence between the eyebrows. 1.15.2 Eyelids The upper and lower eyelids (palpebrae) are modif
2、ied folds of skin that can close to protect the anterior eyeball (Figure 1-21). Blinking helps spread the tear film, which protects the cornea and conjunctiva from dehydration. The upper lid ends at the eyebrows; the lower lid merges into the cheek. Figure 1-21histologyThe eyelids consist of five pr
3、incipal planes of tissues. From superficial to deep, they are the skin layer,a layer of striated muscle (orbicularis oculi),areolar tissue,fibrous tissue (tarsal plates), and a layer of mucous membrane (palpebral conjunctiva) (Figure 1-22). Figure 1-221.15.2.1 Structures of the Eyelids A. Skin Layer
4、 The skin of the eyelids differs from skin on most other areas of the body in that it is thin, loose, and elastic and possesses few hair follicles and no subcutaneous fat. B. Orbicularis Oculi Muscle The function of the orbicularis oculi muscle is to close the lids. Its muscle fibers surround the pa
5、lpebral fissure in concentric knsentrk fashion and spread for a short distance around the orbital margin. Some fibers run onto the cheek and the forehead. The portion of the muscle that is in the lids is known as its pretarsal portion;the portion over the orbital septum is the preseptal portion. The
6、 segment outside the lid is called the orbital portion. The orbicularis oculi is supplied by the facial nerve. C. Areolar Tissue The submuscular areolar蜂窝状的tissue that lies deep to the orbicularis oculi muscle communicates with the sub- aponeurotic-njurtik腱膜下 layer of the scalp. D. Tarsal Plates The
7、 main supporting structure of the eyelids is a dense fibrous tissue layer that-along with a small amount of elastic tissue-is called the tarsal plate. The lateral and medial angles and extensions of the tarsal plates are attached to the orbital margin by the lateral and medial palpebral ligaments. T
8、he upper and lower tarsal plates are also attached by a condensed, thin fascia to the upper and lower orbital margins. This thin fascia forms the orbital septum. E. Palpebral Conjunctiva The lids are lined posteriorly by a layer of mucous membrane, the palpebral conjunctiva, which adheres firmly to the tarsal plates. A surgical incision through the gray line of the lid margin (see below) splits the l
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 高标准农田机械化施工安全措施他
- 教师教研活动培训心得体会
- 西师版小学数学六年级上册线上教学计划
- 七年级数学家庭辅导复习计划
- 教师提升课堂效率双减心得体会
- 钢结构厂房施工方案变更控制措施
- 国有企业事业单位面试自我介绍注意事项与范文
- 落实“双减”政策课后服务措施
- 三年级上学期语文素质拓展计划
- 部编版六年级语文下册期末复习重点计划
- 2024年度-《医疗事故处理条例》解读
- (2024年)面神经炎课件完整版
- 宇宙星空基础知识讲座
- 2024年第九届“学宪法、讲宪法”知识题库及答案
- 2024年重庆市林业局选任市林投公司招聘笔试参考题库含答案解析
- 市场定位与目标客户群体课件
- 电能质量技术监督培训课件
- 食品化学课件
- 国家统计局征信行业报告
- 不良资产尽职调查工作底稿表
- 糖尿病胃轻瘫的护理查房课件
评论
0/150
提交评论