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执业兽医的解剖组胚复习资料之神经系统

  • 2026-05-14 05:40:08
执业兽医的解剖组胚复习资料之神经系统

神经细胞:“神经元”,是神经系统的结构和功能单位。

神经纤维:中枢神经和外周神经的组成部分,由神经元突起构成。

白质:泛指神经纤维聚集的地方。

髓质:分布在小脑皮质深面的白质。

神经核:中枢神经内,由功能相似的神经细胞体和树突聚集而成的灰质团块。

神经节:外周部,神经元的细胞体聚集形成的。

神经纤维束:起止行程和功能基本相同的神经纤维聚集成束。

感受器:包括游离神经末梢、触觉小体、环层小体和肌梭。

神经系统:在畜体调节系统中起主导作用。

神经系统:

1、中枢神经系:⑴脑:位于颅腔内。⑵脊髓:位于椎管内。

2、周围神经系:⑴脑神经:从脑出入,主要分布于头部。⑵脊神经:从脊髓出入,分布于躯干和四肢。⑶植物性神经:①交感神经:从胸腰段脊髓发出;包括颈、胸、腰、荐尾、交感神经干。②副交感神经:从脑干、荐段脊髓发出;包括动眼N、面N、舌咽N、迷走N、盆N。

脊髓:位于椎管内,中部为灰质,周围为白质,灰质中央有一纵贯脊髓的中央管。

脊膜:

1、脊硬膜:其与椎管之间为硬膜外腔(硬膜外麻醉:即自腰荐间隙将麻醉剂注入硬膜腔外)。

2、脊蜘网膜:薄;硬膜F腔与脑腔相通;蜘网膜下腔内含脑脊液。

3、脊软膜:富含血管。

脑:

1、大脑:海马、边缘系统(与内脏活动、情绪变化、记忆有关)。

2、小脑:球形。

3、脑干:①延髓。②脑桥。③中脑:内部室腔狭小,称中脑导水管。④间脑:中脑与大脑之间,分为丘脑和丘脑下部。

第四脑室:延髓,脑桥和小脑共同室为“第四脑室”。

脑神经:共有12对,依次为嗅、视、动眼、滑车、汉、外展、面、前庭耳蜗、舌咽、迷走、副N、舌下神经。

脊神经:分为颈、胸、腰、荐、尾神经。为混合神经,含感觉纤维和运动纤维,由椎管中背侧根(感觉)和腹侧根(运动)形成。

臂神经丛:肩关节内侧,发出的神经有:肩胛上神经、栳神经、正中神经、尺神经。

腰荐神经丛:腰荐部腹侧,发出的神经有:股神经、闭孔神经、坐骨神经(全身最粗、最大的神经)。

内脏神经:分布到内脏器官、血管和皮肤的平滑肌、心及心肌、腺体等的神经。其中的传出神经称为植物性神经或自主神经。

植物性神经的特点:①支配平滑肌,心肌和腺体;②其神经元胞体部分在于中脑、延髓、腰胸段;神经冲动从中枢部传至效应器需2个神经元;③由脑干及第1胸椎至第3-4腰椎段脊髓质外侧柱和荐部脊髓发出;④其节前纤维为细的有髓纤维,节后纤维为细的无髓纤维。⑤一定程度上不受意识的直接(支)控制。

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  1. CONNECT:[ UseTime:0.000592s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000823s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000336s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000246s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000488s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000718s ]
  8. SELECT * FROM `article` WHERE `id` = 466774 LIMIT 1 [ RunTime:0.000515s ]
  9. UPDATE `article` SET `lasttime` = 1778726003 WHERE `id` = 466774 [ RunTime:0.014545s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000279s ]
  11. SELECT * FROM `article` WHERE `id` < 466774 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000440s ]
  12. SELECT * FROM `article` WHERE `id` > 466774 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002669s ]
  13. SELECT * FROM `article` WHERE `id` < 466774 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000778s ]
  14. SELECT * FROM `article` WHERE `id` < 466774 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000876s ]
  15. SELECT * FROM `article` WHERE `id` < 466774 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.022657s ]
0.115647s