Brent Yarina, BTN.com Senior Editor, October 4, 2015

Five Big Ten teams are ranked in the latest AP and Coaches polls, released Sunday afternoon.

[ MORE: Week 5 scoreboard | Big Ten standings | Big Ten stats | Latest polls | Power Rankings | Bowl Projections | Best of Week 5 | Week 5 picks revisited | Week 5 uniforms | What Tom Dienhart learned | Week 5 top performers | Gerry DiNardo's tweets | Dienhart: Wildcats can dream big | John Harbaugh visits Michigan sideline ]

Undefeated Iowa debuts in both polls (No. 22/23), while 4-1 Michigan makes its first appearance in the Coaches Poll (No.  21), moving up to No. 18 in the AP Poll.

Defending national champion Ohio State remains No. 1 in both polls, garnering a total of 88 first-place votes.

Michigan State, previously No. 2, dropped to No. 4/3, and Northwestern moved up in each ranking, to No. 13/14.

Wisconsin fell out of the polls following its home loss to Iowa.

View the full AP Poll:

AP Rankings
Rankings as of 10/4/2015
Rank School Votes Prev
1 Ohio State (5-0) 1444 (38) 1
2 TCU (5-0) 1371 (5) 4
3 Baylor (4-0) 1364 (10) 5
4 Michigan State (5-0) 1291 2
5 Utah (4-0) 1254 (7) 10
6 Clemson (4-0) 1217 12
7 LSU (4-0) 1212 9
8 Alabama (4-1) 1026 13
9 Texas A&M (5-0) 1009 (1) 14
10 Oklahoma (4-0) 976 15
11 Florida (5-0) 935 25
12 Florida State (4-0) 922 11
13 Northwestern (5-0) 753 16
14 Ole Miss (4-1) 731 3
15 Notre Dame (4-1) 721 6
16 Stanford (4-1) 617 18
17 USC (3-1) 498 17
18 Michigan (4-1) 452 22
19 Georgia (4-1) 441 8
20 UCLA (4-1) 415 7
21 Oklahoma State (5-0) 332 20
22 Iowa (5-0) 254 NR
23 California (5-0) 233 24
24 Toledo (4-0) 87 NR
25 Boise State (4-1) 65 NR
Others: Oregon (39) , Duke (31) , Houston (31) , Temple (23) , Memphis (19) , Navy (19) , Arizona State (15) , Mississippi State (11) , West Virginia (8) , Texas Tech (4) , BYU (3) , Kansas State (1) , Missouri (1)

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And the Coaches Poll:

Coaches' Rankings
Rankings as of 10/4/2015
Rank School Votes Prev
1 Ohio State (5-0) 1523 (50) 1
2 TCU (5-0) 1435 (4) 3
3 Michigan State (5-0) 1409 (1) 2
4 Baylor (4-0) 1408 (5) 4
5 LSU (4-0) 1257 (1) 8
6 Clemson (4-0) 1196 11
7 Utah (4-0) 1118 (1) 12
8 Florida State (4-0) 1067 9
9 Oklahoma (4-0) 1009 14
10 Alabama (4-1) 990 13
11 Texas A&M (5-0) 983 15
12 Florida (5-0) 755 23
13 Ole Miss (4-1) 727 5
14 Northwestern (5-0) 707 17
15 Notre Dame (4-1) 674 7
16 Georgia (4-1) 562 6
17 USC (3-1) 540 16
18 Stanford (4-1) 535 20
19 Oklahoma State (5-0) 519 19
20 UCLA (4-1) 401 10
21 Michigan (4-1) 322 NR
22 California (5-0) 311 24
23 Iowa (5-0) 243 NR
24 Boise State (4-1) 100 NR
25 Memphis (5-0) 68 NR
Others: Oregon (64) , Duke (59) , West Virginia (31) , Toledo (24) , Kansas State (17) , Temple (16) , Arizona State (16) , Mississippi State (14) , Navy (12) , Houston (11) , Kentucky (6) , Arizona (5) , North Carolina (4) , Missouri (4) , Wisconsin (4) , Illinois (2) , Indiana (2)